Hot-&-Sour Mushroom Soup

This is tom yam territory: a clear, electric broth that’s sour, spicy, and savory all at once. Two types of mushrooms carry the body — delicate oyster mushrooms with their velvety edge and wispy enoki that add tender, almost noodle-like strands. Serrano chilies drop in the heat, while lemongrass and kaffir lime leaves (tied up in cheesecloth so you don’t crunch them) infuse citrusy, floral aromatics into the stock.

Lime juice and fish sauce go in at the end, off the boil. Heat dulls the sharp sourness of lime and turns fish sauce bitter, so timing matters.

The whole pot comes together in about 20 minutes flat, which is about how long it takes for the rice cooker to finish its cycle.

Kitchen Tips

• If you can’t find fresh kaffir lime leaves, use a strip of lime zest instead. Dried leaves work but have less punch.
• Bruise the lemongrass with the back of a knife before tying it in cheesecloth to release the oils.
• Taste before serving and adjust: more lime for sourness, more fish sauce for salt, more chili for heat. This soup should be assertive in all three directions.
• Use real Thai fish sauce (Red Boat or Squid brand) — cheap fish sauce tastes flat and muddy.

Variations

• Add peeled shrimp in the last 2 minutes of cooking for a classic tom yum variation.
• Toss in a handful of straw mushrooms or shiitake for deeper mushroom flavor.
• Finish with torn cilantro and a splash of coconut milk for a creamy tom kha-style twist.