Kaeng Khua Pu — Southern Crab Curry / แกงคั่วปู

Ingredients

• For the Southern curry paste
• 8–10 dried red chillies, soaked and drained
• 2 stalks lemongrass, tough outer leaves removed, finely sliced
• 30 g galangal, peeled, finely sliced
• 1 kaffir lime, rind only, pith removed, finely sliced
• 80 g shallots, peeled and roughly chopped
• 2 tsp kapi (Thai shrimp paste), good quality fermented paste
• 30 g fresh turmeric, peeled, finely sliced
• 1–1.2 kg live mud crab or blue swimming crabs, killed and halved immediately before cooking, crab fat (tomalley) reserved separately if following pro method
• 400 ml coconut cream, full-fat, for taek man and sauce
• 200 ml coconut milk
• 2 eggs, lightly beaten
• 2 tbsp fish sauce, to season
• 1 tsp palm sugar, grated or shaved

Method

1. 1
   Kill and halve each crab immediately before cooking. Remove and reserve the tomalley (yellow crab fat) from the body cavity. Crack the claws so the sauce can penetrate. The crab must not sit cut and idle — any delay means lost juices.
2. 2
   Pound all paste ingredients — dried chillies, lemongrass, galangal, kaffir lime rind, shallots, kapi, and fresh turmeric — in a granite mortar, working from the hardest to the softest, until a smooth, cohesive paste forms with no fibrous strands visible.
3. 3
   Pour roughly half the coconut cream into a wok over medium heat. Cook, stirring steadily, until the cream splits and the oil rises clearly to the surface — this is the taek man step. The surface will appear glossy and separated, with visible coconut oil pooled above the solids.
4. 4
   Add the curry paste to the split cream. Fry in the coconut oil, pressing and folding, until the paste is deeply fragrant and the raw smell of galangal and chilli is gone. If reserved tomalley is used, stir it into the paste at this point to fuse its richness throughout. This is the step on which the dish lives or dies: under-fried paste will remain harsh and raw; properly fried paste will smell toasted, complex, and deeply fermented.
5. 5
   Add the crab pieces directly to the fried paste — before adding any remaining coconut liquid — and turn each piece to coat thoroughly in the paste. Cook over high heat until the shells turn fully orange-red.
6. 6
   Add the remaining coconut cream and the coconut milk. Stir to combine and bring to a brisk simmer. Cover and cook until the crab flesh is just opaque and pulling slightly from the shell. Remove from heat the moment it is cooked — the crab continues to cook in residual heat.
7. 7
   Return the wok to low heat. Pour the lightly beaten eggs into the sauce in a thin stream, stirring in slow circles as you pour, until the sauce becomes creamy and slightly emulsified — no streaks of raw egg remain and the texture is visibly thicker and more uniform than a standard curry.
8. 8
   Season with fish sauce and palm sugar. Taste: the crab's natural sweetness should be forward, the fermented kapi a deep background note, the chilli heat clean and sustained. Adjust fish sauce only — the crab itself provides the primary salinity.