Spare Spoons Kitchen
Goa's coconut prawn curry, made weeknight-easy with a bag of frozen shrimp — a coconut-milk gravy warm with Kashmiri chili and bright with tamarind, ready in about half an hour.
Onion or shallots — use what you have. A regular onion is the everyday choice; shallots are a touch sweeter and milder, and small onions/shallots are traditional in coastal South Indian curries, so they're a lovely swap if that's what's in the bin. Roughly 3–4 shallots to one medium onion.
Buy raw, not pre-cooked. A bag of raw, peeled, deveined IQF (individually quick frozen) shrimp at 21–30 count is ideal here — big enough to stay juicy, small enough to cook fast. If all you have is pre-cooked frozen shrimp, they're already done: thaw them, skip the simmer, and stir them in off the heat at the very end just to warm through (1–2 minutes), or they turn to rubber.
The souring agent is the soul of the dish. Tamarind gives the classic Goan tang. If you can find kokum (dried purple petals, at Indian groceries), it's the truly traditional choice — simmer 2–3 petals into the gravy and fish them out before serving. Fresh lime juice is the easy everyday stand-in, and you can skip the sour entirely if you'd rather (see Easier, if you like).
For the real Goan color, use Kashmiri red chili powder in place of the paprika (2 tsp). It's the classic choice — deep brick-red with only mild heat. Rani and Deep both sell it at Indian groceries or on Amazon; the paprika-plus-cayenne combo in the ingredient list is the everyday-grocery path.
Full-fat coconut milk only. Lite coconut milk leaves the gravy thin and watery. Shake the can hard before opening so the cream and water recombine. Thai Kitchen Unsweetened Coconut Milk, in the international aisle of most groceries, is a reliable one to reach for.
Heat is yours to set. As written this is gently warm, not fiery. Push the cayenne toward ½ tsp, or add a slit fresh green chili with the aromatics, for a hotter curry.
Make it a full Goan fish curry: swap the shrimp for 1 lb firm white fish (cod, halibut, tilapia) cut into big chunks, and simmer gently 5–6 minutes until it flakes.
Vegetarian / vegan: skip the shrimp and add a drained can of chickpeas (or cubed firm tofu) with the coconut milk; simmer 8–10 minutes so they soak up the gravy. It becomes a coconut-chickpea curry.
Gluten-free: the curry is naturally gluten-free — serve it over rice.
Dairy-free: nothing to change; the richness is all coconut milk.