Ingredients

Equipment Needed

• •6 to 8-quart Dutch oven or heavy-bottomed pot with lid
• •Fine mesh strainer (if making homemade stock)
• •Mussel debearding brush or stiff kitchen brush

Instructions

1. 1

   Build the aromatic base

   Pour the coconut milk and seafood stock into a large Dutch oven or heavy-bottomed pot. Add the lemongrass pieces, galangal coins, torn kaffir lime leaves, and smashed chilies. Bring to a gentle simmer over medium heat, then reduce to low and let the aromatics steep for 10 minutes. Your kitchen will fill with a perfume that's part tropical, part medicinal, entirely intoxicating. Don't rush this. The broth is learning the flavors.

   If you can't find fresh galangal, don't substitute dried. Use fresh ginger instead, understanding that you'll lose some of galangal's piney, peppery character.
2. 2

   Season the broth

   Stir in the fish sauce and palm sugar. Taste carefully. The broth should be salty and slightly sweet, with the coconut providing richness. Remember: you'll add lime juice later, which will brighten everything. The soup tastes different now than it will at the table. Trust the process.

3. 3

   Cook the mushrooms

   Add the torn oyster mushrooms to the simmering broth. Let them cook for 3 minutes until they soften and absorb the coconut milk. Oyster mushrooms have a delicate, almost seafood-like quality that makes them perfect here. They also provide body for anyone who wants to stretch the soup further.

4. 4

   Add the cod

   Nestle the cod pieces into the broth, submerging them gently. Cod takes longest to cook and flakes beautifully when done. Let it simmer undisturbed for 3 minutes. Resist the urge to stir, which would break the fish apart before it sets.

   Cut your fish into generous pieces. They shrink during cooking, and small pieces disappear into the broth. Two-inch chunks become perfect single bites.
5. 5

   Add shrimp and mussels

   Add the shrimp, distributing them evenly in the pot. Arrange the mussels hinge-side down around the edges where they can open freely. Cover the pot and cook for 4 to 5 minutes. The shrimp will curl and turn pink. The mussels will gape open, releasing their liquor into the broth. Discard any mussels that refuse to open after 6 minutes.

6. 6

   Finish with brightness

   Remove the pot from heat. Stir in the lime juice and halved cherry tomatoes. The acid transforms the soup, cutting through the richness and making everything vibrant. Taste again. Adjust with more fish sauce for salt, more lime for brightness, more sugar if it tastes too sharp. The balance should make your mouth water.

7. 7

   Serve immediately

   Ladle the soup into deep bowls, ensuring each serving gets a generous share of all three seafoods and several mussels. Scatter cilantro leaves, Thai basil, and sliced green onions over the top. The herbs should be abundant, not decorative. Serve with sambal oelek on the side for those who want more heat. Eat this with a large spoon and good bread for soaking up what remains.

   Warn your guests about the lemongrass pieces, galangal coins, and lime leaves. They're not meant to be eaten, but they look like they could be. No one wants a mouthful of woody lemongrass.

Chef Tips

• •Sustainable seafood matters. Look for wild-caught Pacific cod certified by the Marine Stewardship Council. Farmed mussels are actually an environmentally responsible choice since they filter water and require no feed. Wild American shrimp from the Gulf or Pacific beat imported farmed shrimp every time.
• •The aromatics can be steeped in the coconut milk up to 4 hours ahead and held at room temperature. This deepens the flavor considerably. Reheat before adding seafood.
• •If you're serving this at a dinner party, have all your seafood prepped and ready on a sheet pan in the refrigerator. The final cooking takes only 8 minutes once your broth is hot. You can be present with your guests instead of trapped in the kitchen.
• •Save shrimp shells and heads in a freezer bag. When you have a pound, simmer them with aromatics to make your own seafood stock. It's superior to anything in a carton and costs nothing.
• •This soup pairs beautifully with an off-dry Riesling or a crisp Grüner Veltliner. The slight sweetness in the wine mirrors the palm sugar while the acidity matches the lime.

Advance Preparation

• •The aromatic broth (coconut milk, stock, and aromatics) can be prepared up to one day ahead and refrigerated. The flavors will intensify overnight.
• •All seafood can be cleaned, prepped, and refrigerated up to 8 hours before cooking. Keep each type separate and well-chilled.
• •Do not add the seafood until you're ready to serve. This soup does not hold or reheat well once the shellfish is cooked. Overcooked shrimp are rubber. Reheated mussels are tough.

Frequently Asked Questions

Nutrition Information

1 serving (about 370g)