Step 1: In a drizzle of olive oil, sweat the onion, garlic, ginger, thyme, carrot leaves, and lemongrass.
Step 2: Add the tomato paste, and the crab, and shortly after, add the butter to enhance the taste.
Step 3: Deglaze with white wine, adjust the seasoning and add the fish stock. Let simmer for about thirty minutes.
Step 4: Add the coriander after 30 minutes.