Salmon and Miso Sour Soup

A Filipino-inspired sour soup combining salmon, tomatoes, and miso for a balanced savory and acidic broth. The dish highlights bright citrus notes with a rich umami backbone.
Ingredients
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1 lb (500 g) skinless, boneless salmon fillet, cut into 1-inch (2.5-cm) cubes (or use salmon heads for the traditional approach)
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1 small onion, chopped
- 4 cloves garlic, minced
- 2 small tomatoes, chopped
- 4 cups (1 liter) chicken stock
- 2 tablespoons fish sauce
- ¼ cup (65 ml) fresh calamansi juice or fresh lemon juice, plus more as needed for acidity
- ½ lb (250 g) daikon radish, peeled, halved lengthwise, and cut into ¼-inch (6-mm) half-moon slices
- 2 tablespoons yellow or white miso, plus more to taste
- Freshly ground black pepper
- 1 cup (50 g) chopped Asian mustard greens or bok choy
Method
- Heat oil in a large pot over moderately high heat.
- Add onion and garlic and cook until the onion is tender and translucent, 3–5 minutes.
- Add tomatoes and cook until softened and beginning to release liquid, 2–3 minutes.
- Add stock, fish sauce, calamansi or lemon juice, and daikon. Bring to a boil, then cover and simmer over low heat until the daikon is tender, 10–15 minutes.
- Ladle about ½ cup (125 ml) of the hot broth into a bowl. Add miso and whisk until dissolved.
- Return the miso mixture to the pot and stir to combine.
- Season salmon with black pepper and add to the pot along with mustard greens or bok choy.
- Simmer gently until salmon is just cooked through and greens are wilted, 2–3 minutes.
- Remove from heat and adjust seasoning with additional citrus juice or miso as needed, making sure the acidity provides brightness.
Serve immediately.
Storage
- Refrigeration: Store up to 2 days. Reheat gently without boiling.
- Freezing: Not recommended due to miso and fish texture.
- Reheating: Warm gently over low heat.