Grilled Butterflied Prawns with Zesty Nam Jim Dressing: An Irresistible Thai Seafood Delight
Prepare to tantalize your taste buds with these exquisite butterflied prawns, generously coated in a vibrant Thai-style Nam Jim dressing featuring fresh lime, fiery chili, and aromatic garlic. Grilled to tender, juicy perfection, these prawns offer an explosion of flavor that makes them an ideal seafood starter, a show-stopping appetizer, or a light yet satisfying main meal. Their ease of preparation belies their gourmet appeal, making them perfect for both weeknight dinners and special occasions.
One of the many advantages of this recipe is its flexibility. The prawns can be meticulously prepared the day before, allowing flavors to meld beautifully. When it’s time to cook, they require mere minutes under a broiler or overhead grill, delivering a quick and impressive dish. For those sun-drenched days, take the cooking outdoors and char them on the BBQ, infusing them with an irresistible smoky depth.
The Nam Jim dressing is truly the heart and soul of this dish. It’s a robust, complex, and utterly delicious sauce that perfectly balances the four fundamental tastes of Thai cuisine: sweet, sour, salty, and spicy. These crowd-pleasing prawns are magnificent served simply on their own as a party appetizer, allowing the vibrant flavors to shine. Alternatively, transform them into a complete meal by pairing them with fluffy steamed rice and a refreshing green salad or a traditional Thai herb salad. Every bite promises an unforgettable culinary experience.
If you’re looking to explore more delightful prawn appetizers, consider these crispy Katsu Prawns, savory Prawn Spring Rolls, or the incredibly easy Prawn Rolls. Each offers a unique way to enjoy this versatile seafood.
Table of Contents
- Why Butterfly Prawns?
- Ingredients You’ll Need
- How to Make Butterflied Prawns
- 1. How to Butterfly Prawns (Step-by-Step)
- 2. Clean and Prepare Your Prawns
- 3. The Nam Jim Dressing: A Flavor Powerhouse
- 4. Dress the Prawns for Maximum Flavor
- 5. Grill to Perfection
- Tips for Perfect Grilled Prawns
- How to Serve Butterflied Prawns
- Storage and Reheating
- More Recipes You’ll Love
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Why Butterfly Prawns? The Secret to Enhanced Flavor and Presentation
You might wonder why taking the extra step to butterfly prawns is worth it. The answer lies in both flavor and presentation. When prawns are cooked in their shell, they retain significantly more moisture and flavor, resulting in a more succulent and enjoyable bite. Butterflying them allows you to achieve this rich flavor profile while making the succulent flesh easily accessible for eating. It also creates a larger surface area, allowing the delicious Nam Jim dressing to seep directly into the meat, infusing every fiber with its vibrant tastes.
Beyond taste, butterflied prawns are visually stunning. They fan out elegantly, making for a beautiful presentation on any platter, especially when garnished with fresh herbs and lime wedges. While the shells remain on, you can generally pull the meat out with a fork, though some enthusiastic diners might prefer to use their hands – so be sure to have plenty of napkins on hand for a delightful, albeit potentially sticky, experience!
Ingredients You’ll Need for Your Thai Prawn Feast
Jump to the recipe card below for precise measurements and full instructions.
- Prawns (Shrimp): The size of your prawns matters here, with larger varieties generally yielding a more impressive and satisfying result. We recommend XXL tiger prawns, which typically range from 13-16 prawns per 500g (or 13-14 per 1lb). King prawns are also an excellent choice, and if you can source jumbo prawns, don’t hesitate – they offer a truly meaty bite! Remember to adjust grilling times based on the size of your prawns to prevent overcooking, which can lead to a rubbery texture. Fresh prawns are ideal, but high-quality frozen prawns, properly thawed, work wonderfully too.
- Chilli: This recipe utilizes two types of chili to build a layered heat and flavor profile. You’ll need one long red chili, which offers a vibrant freshness and moderate heat, and some dried chili flakes (also known as red pepper flakes) for an additional kick and depth. For those who love intense spice, consider adding 2-4 small birdseye chilies, finely minced, to the dressing.
- Lime: Fresh lime juice is non-negotiable for the authentic tang and bright acidity that defines Nam Jim dressing. It provides an irresistible zing that elevates all the other flavors. While lemon juice can be used in a pinch, it will impart a noticeably different, albeit still pleasant, citrus note.
- Garlic: Fresh garlic cloves are essential for their pungent, aromatic quality. Mince them finely using a garlic crusher or chop them meticulously to ensure their flavor is evenly distributed throughout the dressing.
- Oil: A neutral-flavored vegetable oil, such as canola, sunflower, or grapeseed oil, is best here. It helps carry the flavors of the dressing without overpowering the delicate taste of the prawns and assists in achieving that beautiful grilled char.
- Fish Sauce: A cornerstone of Thai cuisine, good quality fish sauce provides the crucial umami and salty foundation for the Nam Jim dressing. Brands like Squid brand are highly regarded for their rich flavor. Do not skip this ingredient, as it’s key to the authentic taste.
- Sugar: A touch of sugar is vital for balancing the intense sourness of the lime and the heat of the chili. White granulated sugar works perfectly, but traditionally, palm sugar is used in Thai cooking and offers a slightly deeper, more caramel-like sweetness if you have access to it.
- Coriander/Cilantro: Fresh coriander (cilantro) is incorporated into the dressing for its bright, herbaceous notes and is also highly recommended as a garnish. Its fresh aroma and peppery flavor beautifully complement the other ingredients, adding a final touch of vibrancy to the dish.
- Fine Sea Salt / Kosher Salt: Used in conjunction with the oil and a portion of the dressing to pre-season the prawns, ensuring even flavor distribution before grilling.
How to Make Grilled Butterflied Prawns: A Step-by-Step Guide
The preparation of butterflied prawns, while requiring a small amount of hands-on time, is straightforward and immensely rewarding. Dedicate approximately 20-25 minutes for the preparation, a task that can easily be done in advance, even the day before cooking. This makes them an excellent choice for entertaining, allowing you to focus on your guests when it’s time to serve. For those seeking a shortcut, simply removing the heads entirely can streamline the cleaning process without significantly compromising the overall flavor, though many culinary enthusiasts appreciate the aesthetic and additional flavor contribution of leaving the heads on.
For detailed, step-by-step instructions and full ingredient quantities, please refer to the recipe card at the bottom of this page.
1. How to Butterfly Prawns (Step-by-Step)
Safety is paramount during this step. Prawn shells can be surprisingly slippery, so proceed with caution and do not rush. Based on various tests, this method has proven to be the safest and most effective for achieving perfectly butterflied prawns:
- Positioning: Place the prawn belly-side down on a sturdy chopping board. This orientation provides a flat, stable surface (the back), preventing the prawn from slipping around as much as it would if butterflied through the belly.
- Initial Cut: Using a sharp, *serrated* knife, apply only light pressure and gently begin to saw along the roundest part of the prawn’s back, from the head towards the tail. The serrated edge helps grip the shell and prevent slippage.
- Deepening the Cut: Once you’ve cut partially through the shell to expose some of the meat, ensure your knife is perfectly aligned along the center of the prawn. With one hand firmly holding the knife handle and the other pressing down on the spine of the blade for control, press straight down firmly to slice the prawn open, almost in half, without cutting all the way through the belly shell.
- Flattening: Carefully open the butterflied prawn and gently press it down flat onto the chopping board. This action creates that beautiful fanned-out shape, ready to absorb all the delicious dressing and grill evenly.
Once you’ve got part of the shell cut through to the meat, make sure your knife is lined up straight along the centre of the prawn and, with one hand holding the knife and the other on top, press straight down.
Open it up, and press it down flat so you have a perfectly butterflied prawn.
2. Clean and Prepare Your Prawns
Once butterflied, it’s time to clean your prawns thoroughly. Carefully pull out and discard the dark digestive tract (the vein) that runs along the back of the prawn. This step is crucial for both aesthetics and taste, as the digestive tract can sometimes contain grit. After deveining, gently rinse the prawn heads under cold running water to ensure they are clean. While prawn heads are often prized for their flavor and add to the presentation, if you’re not keen on eating them, you can simply slice them off during the butterflying process. They are primarily for aesthetics and contribute depth of flavor during cooking rather than being a core part of the edible meat.
3. The Nam Jim Dressing: A Flavor Powerhouse
The Nam Jim dressing is incredibly simple to prepare, yet delivers a complex and exhilarating flavor profile. Traditionally, the chili and garlic would be pounded together in a mortar and pestle to release their full aromatic oils and create a rustic texture. However, for a modern, quicker approach, finely chop your long red chili (with or without seeds, depending on your preferred heat level) and mince your garlic cloves as finely as possible. Then, simply combine all the Nam Jim ingredients – chopped chili, minced garlic, dried chili flakes, fresh lime juice, sugar, and fish sauce – in a glass jar with a tight-fitting lid. Give it a vigorous shake until the sugar fully dissolves and all the ingredients are well incorporated. This method creates a perfectly emulsified and ready-to-use dressing that bursts with flavor.
4. Dress the Prawns for Maximum Flavor
In a large mixing bowl, combine the neutral oil, fine sea salt, and about ¼ cup of your freshly prepared Nam Jim dressing. Add the butterflied prawns to this mixture. Using your hands or tongs, give everything a good but gentle toss, ensuring that each prawn is thoroughly coated. Make an effort to open up the butterflied prawns slightly during this process so that the dressing can seep into the exposed meat. Don’t worry if they start to close back into their natural shape or if a few break apart; the flavor infusion is what matters most. For an even deeper flavor, consider letting the prawns marinate in the dressing for 15-30 minutes at room temperature, or up to an hour in the refrigerator, before grilling. This allows the vibrant flavors to truly penetrate the prawn meat.
5. Grill to Perfection
Preheat your broiler or overhead grill to its highest setting. Position the oven rack approximately 6 inches below the heating element. Line a baking sheet with foil for easy cleanup, then arrange the dressed prawns in a single layer, meat side up. Ensure you drizzle any remaining dressing from the mixing bowl over the prawns – absolutely none of that delicious flavor should go to waste! Broil for a quick 3 to 4 minutes. This timing is ideal for XXL prawns; if your prawns are smaller or larger, adjust accordingly. The key is to cook them until the meat is fully opaque white and slightly pink, but still visibly juicy and plump. Overcooking will result in a rubbery texture, so keep a close eye on them. If cooking in batches, prepare a second baking sheet while the first batch cooks.
BBQ Grilling Option:
For an authentic smoky flavor, these prawns are also fantastic on the barbecue. Preheat your BBQ to medium-high heat. Place the butterflied prawns meat-side down on the grill grates and cook for 2-3 minutes until they start to turn pink and develop some char marks. Flip them over and grill for another 1-2 minutes, or until the meat is opaque and cooked through. Keep the shell on for both protection and flavor.
Tips for Perfect Grilled Prawns Every Time
Achieving perfectly grilled prawns is all about attention to detail. Here are some extra tips to ensure your dish is a resounding success:
- Don’t Overcrowd the Pan/Grill: Cook prawns in batches if necessary. Overcrowding lowers the temperature and steams the prawns instead of grilling them, preventing a good sear and even cooking.
- High Heat, Short Time: Prawns cook very quickly, especially when butterflied. High heat ensures a quick cook and prevents them from drying out.
- Visual Cues for Doneness: As mentioned, look for opaque white flesh with pink edges. A slight curl is also normal. When they lose their translucency, they’re ready. A minute too long can make them rubbery.
- Even Thickness: Try to choose prawns of similar size so they cook uniformly. If you have a mix, group similar sizes together for cooking.
- Marinade Time: While the dressing is applied before grilling, allowing a short marinade time (15-30 minutes) can significantly enhance the flavor depth. Avoid marinating for too long (e.g., overnight) with highly acidic dressings like Nam Jim, as the acid can start to “cook” the delicate prawn meat, making it mushy.
- Preheat Thoroughly: Whether using a broiler or a BBQ, ensure your cooking surface is fully preheated to the correct temperature before adding the prawns. This helps with even cooking and prevents sticking.
How to Serve Butterflied Prawns for Any Occasion
The beauty of these butterflied prawns lies in their versatility for serving. They shine brightly whether presented as an elegant appetizer or a hearty main course.
As an Appetizer or Party Platter:
For a truly impressive presentation, arrange the grilled prawns artfully on a large, beautiful platter in a “share style” fashion. Before serving, drizzle a little extra Nam Jim dressing over the top, allowing its glossy finish and vibrant aroma to entice your guests. Crucially, leave the remaining dressing in a small bowl on the side, enabling individuals to add as much or as little to their prawns as they desire, customizing their flavor experience.
These prawns are wonderful finger food, but because the shells are left on and coated in dressing, things can get a bit delightfully messy! Ensure you have a generous stack of napkins or even small finger bowls with warm water and lime slices readily available for your guests.
As a Full Dinner:
Transform these delectable prawns into a complete and satisfying dinner by pairing them with classic Thai accompaniments. Simple steamed jasmine rice is a perfect foil, soaking up the savory juices and providing a comforting base. To add freshness and a burst of herbaceous flavor, prepare a vibrant Thai salad. This isn’t just any green salad; think crisp lettuce leaves generously mixed with an abundance of fresh herbs like fragrant mint, bright coriander (cilantro), and distinctive Thai basil. The key is to treat these herbs like salad leaves – don’t skimp, and leave them whole or roughly torn to maximize their impact. A light lime-based vinaigrette would complement this beautifully.
Consider also adding a side of stir-fried seasonal vegetables or a simple cucumber relish to complete the meal. The balance of textures and flavors ensures a well-rounded and memorable dining experience.
Storage and Reheating Tips for Leftover Prawns
While these butterflied prawns are best enjoyed fresh off the grill, you might occasionally have leftovers, or perhaps you made an extra batch for meal prep. Here’s how to handle them:
- Storage: Allow any leftover prawns to cool completely to room temperature (within 2 hours of cooking). Transfer them to an airtight container and store them in the refrigerator for up to 1-2 days. It’s best to store the remaining Nam Jim dressing separately in a sealed jar in the fridge for up to a week.
- Reheating: Reheating prawns can be tricky, as they tend to dry out or become rubbery if overcooked. For best results, gently reheat them.
- Oven/Toaster Oven: Preheat your oven to a low temperature, around 275-300°F (135-150°C). Arrange the prawns in a single layer on a baking sheet. Heat for about 5-7 minutes, or until just warmed through. Avoid high heat.
- Stovetop: A quick sauté in a lightly oiled pan over medium-low heat for 2-3 minutes can also work. Be careful not to cook them further, just warm them.
- Microwave (Not Recommended): While possible, the microwave is generally not recommended for reheating prawns as it tends to make them rubbery and unevenly heated. If you must, use a very low power setting for short bursts.
- Serving Cold: Leftover grilled prawns are also delicious served cold or at room temperature, perhaps tossed into a salad or a noodle dish.
More Irresistible Prawn Recipes You’ll Love
If you’re a fan of the succulent flavors of prawns and seafood, you’re in for a treat! Explore these other fantastic recipes that celebrate the versatility and deliciousness of shrimp, perfect for any occasion:
- Sizzling Garlic Prawns: A quick and aromatic dish, bursting with garlicky goodness.
- Crispy Prawns: Perfectly crunchy, these prawns are a delightful snack or appetizer.
- Thai Panang Curry with Prawns: A rich, creamy, and mildly spicy curry that’s both comforting and exotic.
- Salt and Pepper Prawns: A classic take on a takeout favorite, simple yet incredibly flavorful.
- Creamy Prawn Pasta: Indulgent and satisfying, perfect for a cozy dinner.
- Thai Fish Cakes: While not prawns, these flavorful cakes share similar vibrant Thai spices and make a great accompaniment or alternative.
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Butterflied Prawns (with Nam Jim Dressing)
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Ingredients
- 24 shell-on XXL tiger prawns any size fine, cooking time will vary
- 1 teaspoon fine sea salt / kosher salt
- ¼ cup neutral flavoured vegetable oil
NAM JIM DRESSING
- 1 long red chilli finely chopped with or without seeds
- 4 cloves garlic minced
- ½ teaspoon hot dried chilli flakes (or 2-4 birdseye chilli to taste)
- ¼ cup lime juice (2-3 limes)
- ¼ cup white sugar
- 2 tablespoons fish sauce
- 1 tablespoon finely chopped coriander (cilantro)
TO SERVE
- lime wedges
- Fresh coriander/cilantro
For best results, always weigh ingredients where a weight is provided
Equipment
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2 Large baking sheets
Instructions
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In a mason jar combine the Nam Jim dressing ingredients and shake well to combine. Set aside.
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The safest way I’ve found to butterfly prawns is to lay them flat on their belly and press down a little. Holding each side of the prawn with one hand, with a serrated knife in the other hand, very carefully start to cut along the back of the prawn where it humps up a little. Once you’ve cut through the top part of the shell, making sure the knife is in line right down the centre of the head, back and tail, press down to slice it in half. Repeat with all the prawns.
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Remove the digestive tract and gently rinse the heads clean. You can cut the heads away if you prefer.
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Transfer the prawns to a large bowl with the oil, salt and ¼ cup of the dressing. Toss to coat evenly, trying to make sure to get the meat side well coated. Set aside remaining Nam Jim for serving.
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Preheat overhead grill / broiler to high and have a rack about 6 inches below.
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Place the prawns onto a baking sheet meat side up. You can fit about 12-14 onto one large sheet, so if you have a second, prep that while the first batch are in the oven. As you take them from the bowl, open each one up and dip in any dressing that’s sunk to the bottom of the bowl so you don’t leave any behind. Grill/broil for 3-4 minutes until just cooked. The size of the prawns will determine how long they take to cook, but it’s easy to tell when they’re done – the meat will be opaque white.
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Transfer to a platter. Serve with coriander leaves and wedges of lime for squeezing over and the remaining Nam Jim sauce.
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Please take a moment to leave a comment & rating. It’s appreciated and so helpful.
Notes
- Tablespoons: I use a standard Australian 20ml tablespoon (equal to 4 teaspoons). Check yours before measuring.
- Prawns: I used the XXL tiger prawns which are about 13-15 per 500g/1.1lb. You can use any type of prawns/shrimp but the large ones are easier to butterfly cut. King prawns work great too. Jumbo prawns would be fantastic and meaty. The size of your prawns/shrimp will dictate the time required for cooking.
- You can also cook them on a BBQ. Preheat to medium-high, then grill meat side down for 2-3 minutes, flip and grill a further 1-2 minutes.
- Serves: This recipe serves 4 as a main meal or 6-7 as an appetizer.
- Nutrition details are approximate only – scroll below the recipe to find the full nutritional information.
Calories from Fat 144