Here’s an old recipe from a dead website. Never did get around to trying it. I was surprised I’d even saved it.
Tom Kha Tofu - Thai Coconut Citrus Soup
For tofu:
1/2 cup soy sauce
1/4 cup Chinese black vinegar (or use an Asian fish sauce)
1/4 cup nutritional yeast
3 tablespoons sesame oil
1 quart vegetable stock
2 14 oz. cans coconut milk
3 cloves finely minced garlic
1/2 cup lime juice
1/4 cup lemon juice
1 pound tofu - not silky, but the kind in the container filled with water
1/3 cup thinly sliced galanga root (or substitute ginger), bruised
2 lemon grass stalks, trimmed and cut into 3-4" lengths.
1/4 cup fish sauce
2 tablespoons cayenne/red chili powder or to taste
2 tablespoons tabasco or to taste
2 tablespoon mustard powder
2 tablespoon onion powder
1/4 cup bruised kaffir lime leaves or 1 tablespoon grated lime zest
black pepper to taste (I doubt you’ll want salt)
1 cup fresh cilantro leaves, no stalks
12 oz. straw mushrooms
two thinly sliced Thai red peppers
Press the block of tofu under a weight between folded up paper towels to extract water from the tofu for 20 minutes.
Cut the tofu into 1/2"-3/4" cubes. In a container with a lid or a big sealing plastic bag, add the soy sauce, black vinegar, sesame oil, nutritional yeast (different from baking yeast - you can find it in a health food store) and the tofu. Shake the container up to coat the tofu and let it sit for ten minutes. Preheat your over to 350 F
Spread the tofu cubes out in a single layer on a baking sheet and put into the preheated 350 F oven for fifteen minutes.
While the tofu is cooking, combine all the other ingredients except the mushrooms and cilantro together, stirring well. Bring to a boil and reduce to a simmer.
After the tofu has been in the oven for fifteen minutes, take it out, flip the cubes and put the tray back in the oven.
Taste the soup. The lemongrass and galanga/ginger flavors will be developing, but test the balance between the veg/coconut milk and the citrus. If the soup feels too bland, add more lime juice and/or spicy stuff. If it tastes too spicy - well, tom kha tofu ain’t beanball.
After the tofu has been in the oven for a total of thirty minutes, take the tray out of the oven and add the tofu, mushrooms and cilantro. Cook until the mushrooms are warmed through and the cilantro has wilted.
Eating the soup is interesting. You can’t really eat the woody lemongrass and galanga root or the waxy kaffir lime leaves (certainly not in large quantities) , but they do add flavor in the pot. You can either strain the soup before adding the cilantro, mushrooms, and tofu, or you can deal with having a little pile of debris at the bottom of your soup bowl. I’ve always had it with debris at Thai restaurants, but your kitchen, your rules.
Serve with coconut rice and a Thai iced tea.