Thai Clam Soup with Mushrooms, Lime Leaves, and Cilantro

Thai Clam Soup

The clams supply their own savory broth as they open, while a modest amount of coconut milk rounds out the chile and citrus aromatics without overwhelming the shellfish.

Ingredients

• 4 lb live Manila or littleneck clams
• 1 tablespoon avocado oil
• 3 medium shallots, thinly sliced
• 3 cloves garlic, thinly sliced
• 2 stalks lemongrass, tough outer layers removed, bruised and cut into 3-inch lengths
• 6 thin slices fresh galangal, or ginger if unavailable
• 5 makrut lime leaves, lightly torn
• 1 red Fresno chile, thinly sliced
• 8 oz oyster mushrooms, torn into bite-size pieces
• 2 cups water
• 1 cup unsweetened full-fat coconut milk, well stirred
• 1–2 teaspoons gluten-free fish sauce, to taste
• 2 tablespoons fresh lime juice, plus more to taste
• 1 cup roughly chopped cilantro leaves and tender stems
• 1 lime, cut into wedges

Instructions

1. Scrub the clams under cold running water. Discard cracked clams and any open clams that do not close when tapped. If the supplier recommends purging, follow their instructions before cooking; keep the clams cold until needed.
2. Heat the avocado oil in a wide, heavy pot over medium heat. Add the shallots and cook for 3–4 minutes until translucent, without browning. Add the garlic, lemongrass, galangal, lime leaves, and chile; stir for 1 minute until fragrant.
3. Add the mushrooms and stir for 2 minutes. Pour in the water and coconut milk. Bring to a gentle simmer and cook uncovered for 7–8 minutes, until the mushrooms are tender and the broth smells distinctly citrusy.
4. Add the clams, cover, and bring back to a lively simmer. Cook for 5–10 minutes, gently shaking the pot occasionally. Check after 5 minutes and transfer opened clams to a warm bowl once their meat is opaque and firm. Continue cooking the remaining clams briefly; discard any that remain closed.
5. Taste the broth before adding fish sauce, since the clam juices may provide enough salt. Add fish sauce as needed. If the broth is too salty, dilute it with a little hot water.
6. Return the cooked clams and any collected juices to the pot just long enough to warm through. Remove from the heat and add the lime juice and half the cilantro.
7. Remove the lemongrass and galangal before serving, and remove the lime leaves where practical. Finish with the remaining cilantro and serve with lime wedges.

Notes

• Use a pot wide enough for the clams to open freely, or steam them in two batches in the same broth.
• Keep the coconut broth at a gentle simmer before adding the clams; prolonged hard boiling can make it oily.
• Galangal gives a sharper, more resinous fragrance than ginger. Either works, but the flavor will differ.
• Whole lime leaves and woody aromatics flavor the broth but are not meant to be eaten.

Overall Timing / Workflow

Have all the aromatics and garnishes ready before the clams enter the pot so the shellfish can be served as soon as it is cooked.

Instructions

1. 0:00 — Inspect and scrub the clams, then refrigerate while preparing the remaining ingredients. Allow extra time beforehand if purging is needed.
2. 0:10 — Slice the shallots, garlic, and chile; prepare the lemongrass, galangal, mushrooms, cilantro, and lime.
3. 0:20 — Soften the aromatics, then simmer the mushrooms in the coconut broth.
4. 0:32 — Add the clams and cover. Warm four wide bowls while they steam.
5. 0:40 — Adjust the broth with fish sauce and lime, add cilantro, and serve immediately.

Plating

Wide bowls show off the open shells and keep the mushrooms and herbs accessible above the shallow broth.

Instructions

1. Divide the clams and mushrooms among four warmed, wide bowls, arranging some open shells facing upward.
2. Ladle the broth and softened shallots around the clams. Scatter the reserved cilantro generously over the top.
3. Serve with lime wedges, soup spoons, and a separate bowl for empty shells.

Leftover Path

Removing the shells makes the leftovers easier to store, and reheating the broth before adding the clam meat limits toughening.

Instructions

1. Remove leftover clam meat from its shells. Refrigerate the meat and broth in separate shallow containers within 2 hours of cooking.
2. Use within 1–2 days. Bring the broth and mushrooms to a simmer, then add the clam meat and heat briefly until it reaches 165°F throughout.
3. Refresh with lime juice and fresh cilantro after reheating.

Notes

• Reheat only the portion you plan to eat; repeated heating makes clams rubbery.