Isso Baduma (Sri Lankan Prawn Stir-Fry)
Also known as Spicy Fried Prawns
Isso baduma is a dry Sri Lankan prawn stir-fry. Plump prawns go into a pan over high heat with onion, garlic, ginger, green and red chilli, curry leaves and spices, get tossed fast until they are just cooked, and end up glossed in a sticky, fiery, dry-fried masala. Isso means prawn and baduma means tempered or stir-fried, and that is exactly what this is: no coconut gravy, no sauce to spoon, just spicy fried prawns clinging to a fragrant, near-dry tangle of aromatics. You'll also see it searched as Sri Lankan prawn stir-fry or spicy fried prawns, and it is fast, bold and built for eating hot over rice.
A dry, fiery prawn stir-fry tossed fast over high heat until the prawns are just cooked and coated in a sticky, spicy masala. No gravy, all punch.
- Total time
- 35 min
- 20 min prep · 15 min cook
- Serves
- 4 people
- Difficulty
- Medium
- Spice level
- Authentic Hot
- Country help
- USA · UK · AU · CA substitutes included
CeylonCooking
ceyloncooking.com/recipes/isso-baduma
Isso Baduma
Scan to open on your phone
Nutrition
Estimated values, per serving.
About This Dish
Ask for isso baduma in a Sri Lankan home and you are getting prawns at their most direct. Isso is the Sinhala word for prawn and baduma comes from badanawa, to temper or stir-fry, so the name simply says spicy fried prawns. Unlike the coconut prawn curries that simmer away on the stove, baduma is a quick, high-heat dish. The pan is hot, the aromatics go in fast, and the prawns are tossed through and pulled off the heat the moment they curl. What you end up with is dry, sticky and fiery, every prawn coated in toasted spice rather than swimming in gravy.
Tempered, dry-fried dishes like this run right through the island's cooking, and seafood takes to the style beautifully. Along the coast, where prawns are everyday food, cooks learned that the sweetest, freshest catch does not always want to be drowned in coconut milk. A short, sharp fry in a screaming pan keeps the prawns tender and lets their natural sweetness push back against the chilli and the savoury bite of curry leaves. It is the kind of dish that gets made when someone wants seafood with attitude and does not want to wait.
What makes a good isso baduma is heat and speed. You fry the base of onion, garlic, ginger and chilli until it is fragrant and just softened, toast the spices until they smell dark and nutty, then throw in the prawns and toss everything fast so the masala dries down and clings rather than turning into a sauce. Done right, it is properly hot, deeply savoury and a little sticky, with prawns that are juicy inside and lightly caramelised at the edges. Done wrong, the prawns turn to rubber, so timing is everything.
Choosing Prawns for Stir-Frying
The whole dish rests on the prawns, so it pays to choose well. Medium to large raw prawns are ideal for baduma: small enough to cook through in the brief time they spend in the pan, large enough to stay juicy and not vanish into the masala. Whether you use shell-on or peeled is a genuine choice. Shell-on prawns hold more moisture and flavour and protect the flesh from the fierce heat, so they stay sweeter and harder to overcook, though they are messier to eat. Peeled and deveined prawns are tidier on a sharing plate and let the sticky masala cling directly to the flesh. Many cooks split the difference and leave the tail shell on for looks and grip while peeling the body.
Fresh or frozen matters less than how raw they are. Always start with raw prawns, never pre-cooked ones, because pre-cooked prawns have nothing left to give and turn instantly rubbery when they hit a hot pan. Frozen raw prawns are excellent here and often the most practical choice, as long as you thaw them fully and pat them bone dry. The reason high heat and a short cook keep prawns tender comes down to their muscle: a prawn is dense, lean protein that sets the moment it's cooked through, and every extra second on the heat tightens those fibres into a tough, springy chew. A hot pan cooks the outside fast so the inside is just done before the flesh has time to seize, which is exactly why baduma is a quick, fierce fry and not a slow simmer.
What It Should Taste Like
Sweet, tender prawns glossed in a sticky, near-dry masala. It's properly hot with chilli, savoury with curry leaves and garlic, and just lightly caramelised at the edges. There is no gravy to spoon, only spice clinging to the prawns. Each bite should land fiery, fragrant and juicy all at once.
Ingredients
This recipe makes 4 servings. Change the number and every amount below updates with it. Substitutes for hard-to-find items are in the sidebar.
The US button converts grams, millilitres and centimetres to ounces, cups and inches. Spoon measures stay exactly as they are.
Open this in the recipe converter
The Prawns
- Raw prawnsShell-on or peeled, deveined.500 g
- Ground turmeric¼ tsp
- Chilli powder½ tsp
- Salt½ tsp
- Lime juice1 tsp
The Stir-Fry
- Coconut oil2 tbsp
- OnionCut into chunky petals or thick slices.1 large
- GarlicSliced.4 cloves
- GingerJulienned.1 tbsp
- Green chilliesSliced lengthways.2-3
- Dried red chilliesBroken, or 1 tsp chilli flakes.2-3
- Curry leaves2 sprigs
- Pandan (rampe)Optional.5 cm piece
- Sri Lankan roasted curry powder1 tsp
- Chilli powderTo taste.½ tsp
- Black pepperFreshly ground.¼ tsp
- Saltto taste
- LimeTo finish.½
Method
Follow these 7 steps. Each one explains not just what to do, but why it matters.
Ready to Start Cooking?
The screen shows one step at a time, with just the ingredients that step needs at your serving count, a timer you can tap, and your phone kept awake.
- 01
Clean and Devein the Prawns
Rinse the prawns, then devein them by running the tip of a small knife down the back and lifting out the dark vein. Decide whether to peel them fully, leave the tail shell on, or keep them shell-on.
This bit is unglamorous but it sets up everything that follows. The dark line running along the back is the prawn's digestive tract. While it is harmless, it can carry grit and a faintly bitter, muddy taste, so lifting it out gives you a cleaner, sweeter result. A shallow nick along the back is enough to hook it out with the knife tip or your fingers. This is also the moment to commit to shell-on or peeled: shell-on protects the flesh and keeps it sweet and juicy under fierce heat, while peeled lets the spicy masala grip the prawn directly. There is no wrong answer, only what you want to eat.
Tip: A shallow score down the back of a peeled prawn does two jobs: it removes the vein and helps the prawn curl prettily and grab more masala as it cooks.
- 02
Dry and Marinate the Prawns
Pat the prawns properly dry with paper towels, then toss them with the turmeric, chilli powder, salt and lime juice. Leave them for 10 minutes while you get the aromatics ready.
Drying the prawns is the step most people skip, and it is the difference between a fry and a stew. Any water clinging to the prawns hits the hot pan, drops the temperature and turns to steam, so instead of searing they boil in their own moisture and the masala goes watery rather than sticky. Pat them properly dry and they can hit the oil and brown. The short marinade does two quiet jobs: the turmeric and chilli season the prawns from the surface in, so the spice is not just sitting on the outside, and the lime tightens the flesh slightly and brightens the finished dish. Ten minutes is plenty. A long acidic soak would start to cure the prawns and make them mushy.
Tip: Don't marinate in lime for much longer than 10 to 15 minutes. The acid starts to cook the prawns the way it does in ceviche, leaving them soft and mealy once they hit the pan.
- 03
Prepare the Aromatics
Cut the onion into chunky petals, slice the garlic, julienne the ginger and slit the green chillies. Have the dried red chillies, curry leaves, pandan and ground spices measured out and within reach of the stove.
Baduma is cooked fast and hot, so there is no time to chop once the pan is going. Everything happens in a couple of minutes from the moment the prawns go in, and a prawn left sitting in a hot pan while you hunt for the chilli powder is a prawn turning to rubber. Cutting the onion into chunky petals rather than fine slices is deliberate. You want it to keep some crunch and char at the edges rather than melt away, because this is a stir-fry, not a soft curry base. Pre-measuring the spices by the stove is the single habit that separates a clean, fiery baduma from a panicked, overcooked one.
Tip: Treat this like wok cooking and lay everything out in the order it goes into the pan. Once you start frying, you shouldn't have to leave the stove.
- 04
Build the Aromatic Base
Heat the coconut oil in a wide pan or wok over high heat until it shimmers. Add the curry leaves, pandan and dried red chillies and let them crackle for a few seconds, then add the onion, garlic, ginger and green chilli and stir-fry for 2-3 minutes.
Get the pan genuinely hot before anything goes in, because high heat is the whole point of baduma. The instant the curry leaves and dried chilli hit the oil they snap and let off a sharp, smoky, savoury smell that perfumes the oil the prawns will cook in. Keep everything moving with a fast, constant toss so the garlic and ginger turn fragrant without burning and the onion softens in the centre while staying crisp and lightly charred at the edges. You are not trying to caramelise this base the way you would for a slow curry. You want it just-softened, alive and a little blistered, ready to wrap around the prawns.
Tip: If the garlic looks like it might catch and burn before the onion softens, lift the pan off the heat for a few seconds and keep tossing. Burnt garlic turns the whole dish acrid.
- 05
Toast the Spices
Push the aromatics to one side, drop the roasted curry powder, extra chilli powder and black pepper into the hot oil and stir for 15-20 seconds, then mix everything together.
Giving the ground spices a moment in the hot oil before the prawns go in wakes them up and burns off the raw, dusty edge that ground spice carries straight from the jar. In just a few seconds you'll smell the roasted curry powder deepen into something darker and nuttier and see the mixture turn a richer rust-red. The black pepper is doing real work here, not just adding heat. In a dry tempered dish like this its warm, woody bite carries differently from chilli and gives the masala a rounder, more grown-up depth. Keep it brief, because turmeric and chilli scorch fast on their own and turn bitter if they sit too long.
Tip: If the spices threaten to catch, add a teaspoon of oil rather than water. A splash of water here would loosen the masala into a sauce, which is exactly what you're trying to avoid.
- 06
Stir-Fry the Prawns
Turn the heat to its highest, add the prawns in a single layer and stir-fry hard for 3-4 minutes, tossing constantly, until they turn pink and opaque and curl into a loose C shape.
This is where the dish is won or lost. Spread the prawns out so they sear instead of crowd and steam, and keep the heat fierce and the prawns moving so they cook fast and evenly. Watch the colour closely: raw grey turns to coral pink and the flesh goes from glassy to opaque from the outside in. The moment they curl into a loose C they are done. A tight, clenched O means you have gone too far and they will be rubbery. Because the pan is so hot and there is no gravy, this happens quickly, three to four minutes at most, so do not wander off. Shell-on prawns are more forgiving and give you a few extra seconds; peeled ones cook faster still.
Tip: If you're not sure, cut one prawn in half at the three-minute mark. The centre should be just opaque, not glassy. They keep cooking in the residual heat, so pull them a touch early.
- 07
Dry Down the Masala and Finish
Toss everything together over high heat for a final minute so any moisture cooks off and the spices cling to the prawns in a sticky, near-dry coat. Season with salt, squeeze over the lime and serve straight away.
The last minute is what makes it a baduma rather than a loose stir-fry. Any liquid the prawns or onion released should sizzle away now, and as it does the masala tightens and turns sticky, glossing each prawn instead of pooling in the pan. You want it dry but not bone dry, with the spice clinging and the edges of the prawns just catching and caramelising on the hot metal. The squeeze of lime off the heat lifts the whole thing, cutting the richness of the toasted spice and making the prawns taste even sweeter. Taste for salt one last time and get it to the table while the prawns are at their juicy best.
Tip: Serve it the moment it's done. Like all prawn dishes, baduma waits for no one: left sitting in a hot pan the prawns keep firming up, so the difference between juicy and rubbery is a matter of minutes.
Common Mistakes to Avoid
- Not patting the prawns dry, so they steam in the pan and the masala turns watery instead of sticky.
- Cooking on low or moderate heat; baduma needs a screaming hot pan to sear the prawns fast and dry the masala down.
- Overcooking the prawns past a loose C shape, which turns them tight and rubbery.
- Crowding the pan, so the prawns release liquid and boil rather than fry. Use a wide pan or work in two batches.
- Adding water or coconut milk; this is a dry stir-fry, and liquid turns it into a curry.
- Marinating in lime for too long, which begins to cure the prawns and leaves them soft and mealy.
- Burning the garlic or spices in the hot oil, which makes the whole dish taste acrid.
Serving Ideas
- Hot over plain steamed rice or red rice, with the sticky masala doing the work of a sauce.
- As a fiery dish on a rice and curry plate, balanced by a cooling pol sambol and a mild dhal.
- As a sharing plate or short eat with cold drinks, eaten straight from the pan.
- Tucked into roti or bread with sliced onion and a squeeze of lime.
- Alongside a coconut sambol and a simple vegetable curry for a quick weeknight spread.
Building a whole plate around it? Start from our seafood rice and curry menu, which sets out what to cook alongside it and in what order.
Storage and Make-Ahead
Eat these hot, right off the heat, when the prawns are still juicy. They will keep for 1 day in a sealed container in the fridge. Reheat them very briefly in a hot pan, just until warmed through, and accept that the prawns will firm up a little. I wouldn't freeze this one. Cooked prawns go watery and rubbery after thawing.
Two Ways to Cook It
Use peeled, deveined frozen raw prawns, thawed and patted dry, and a decent shop-bought roasted curry powder. Keep the chilli moderate. Chop all the aromatics before you start. Get a wide non-stick pan screaming hot, as high as your stove will go. Fry the base, toast the spices, then toss in the prawns for 3 to 4 minutes until they curl. Let the masala dry down for a minute, then finish with lime. Honestly, speed and a hot pan matter more than technique.
Use fresh shell-on prawns, deveined but with the tail shell left on for grip and flavour, and home-roasted, freshly ground curry powder. Cook in coconut oil over a fierce flame in a wide wok or seasoned pan. Use a generous hand of dried red chilli and fresh green chilli for real heat, and add a pinch of roasted Maldive fish flakes with the spices for a deeper savoury note. Toss hard and fast so the prawns sear and the masala caramelises and clings.
Lighter and Healthier Version
Isso baduma is already one of the leaner ways to cook prawns. There's no coconut milk and the prawns are pure lean protein. The fat comes almost entirely from the frying oil, so a few small changes make it lighter still without losing the fierce, dry-fried character that makes it baduma.
Cut the Oil
Fry the base in 1 tablespoon of oil instead of 2, in a good non-stick or well-seasoned pan. The high heat and dry masala carry the flavour, not the fat, so you really don't lose much.
Load up on Aromatics and Veg
Bulk the dish out with extra onion, a sliced capsicum or a handful of green beans tossed in with the base. You stretch the same prawns and oil further, and you add fibre and crunch.
Lean on Chilli and Lime, Not Oil
A dry stir-fry gets its punch from heat and acid, so be generous with fresh chilli, black pepper and the finishing lime instead of reaching for more oil to carry the flavour.
Naturally Low-Carb and High-Protein
Since there's no coconut milk, sugar or flour, baduma is naturally low in carbohydrate and high in protein. Serve it with extra vegetables or a smaller portion of rice for a lighter, protein-forward plate.
Frequently Asked Questions
Isso baduma is a dry Sri Lankan prawn stir-fry. Isso is the Sinhala word for prawn, and baduma means tempered or stir-fried, so the name simply means spicy fried prawns. Plump prawns are tossed quickly over high heat with onion, garlic, ginger, green and red chilli, curry leaves and spices until they are just cooked and coated in a sticky, fiery, near-dry masala. Unlike a prawn curry, there is no coconut gravy. The spice clings directly to the prawns. People also search for it as Sri Lankan prawn stir-fry or spicy fried prawns.
Cooked It? Tell Us How It Went
Your notes on this isso baduma help the next person get it right: what you swapped, what you would do differently, where the recipe should have warned you. Tap a star if you are in a hurry, or write a few lines if you have a minute.
You Might Also Like
Sri Lankan Home Cooking Starter Pack
40 authentic Ceylon recipes made simple for foreign kitchens: spice guide, pantry checklist, substitute guide, 7-day meal plan and printable shopping lists.