Favourite Vegan Hot & Sour Soup

This is a Thai-influenced take on the classic Chinese hot and sour soup, swapping out the traditional cornstarch-thickened broth for a clear, brightly acidic stock built around lime juice, fresh chilies, and aromatic ginger. The result tastes more like Thai tom kha than the brown, gloopy hot and sour from the takeout menu, and that’s the appeal.

Dried Chinese mushrooms (typically shiitake) are the umami backbone. The recipe gives them special treatment: a quick boil-and-discard rinse to clear sand and grit, then a second hour-long soak to fully rehydrate and develop their meaty, woodsy flavor. That patient prep is what gives the broth its depth.

The “hot” comes from fresh green chilies sliced into the broth; the “sour” comes from a generous combination of lime juice, lemon juice, and thin slices of whole lime peeled and floated in the broth. The peel slices release citrus oils as they simmer and add a layer of fragrance you cannot get from juice alone.

The critical instruction in the recipe is the taste-and-balance step. Hot, sour, and salty should all read clearly without any single one dominating. Add more chili for heat, more lime for sour, more soy for salt until the broth tastes lively in your mouth. This is not a recipe that runs on autopilot; it needs your tongue.

Chef Tips

• Use silken or soft tofu for the most traditional texture. Firm tofu works but lacks the silky mouthfeel that defines this style.
• Don’t skip the lime peel slices in the broth. Most recipes leave them out, but the fragrance they release is what makes this version distinctive.
• Serve immediately after garnishing with cilantro. The bright flavors of fresh herbs and citrus fade fast in hot broth.
• Have extra sliced chilies at the table (the recipe’s own suggestion) for guests who want more heat.

Variations

• Add a stalk of bruised lemongrass and a few makrut lime leaves to the broth for a fuller Thai aromatic profile.
• Swap the soy sauce for vegan fish sauce for an even more Southeast Asian flavor.
• Stir in a handful of bean sprouts and a few snow peas during the last minute for extra crunch and texture.