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U.S. measurements first, metric equivalents in parentheses. Conversions are approximate; oz means weight ounces, not fluid ounces.
4 cups (1 L) water 1 piece kombu (about 4 x 4 in (10.2 cm) / 10 x 3.94 in (10 cm)) 1 cup (10 g) katsuobushi (bonito flakes) 1 tsp (5 ml) light soy sauce, or to taste 1 tsp (5 ml) mirin (optional) 1 tsp (5 ml) finely julienned fresh ginger 2 tsp (10 ml) yuzu juice (or lemon juice if unavailable) 1 tbsp (15 ml) dried wakame 6 oz (170 g) silken tofu, cut into 1 / 2-inch (1.25 cm) cubes 2 scallions, thinly sliced
4 cups (1 L) water 1 piece kombu (about 4 x 4 in / 10 x 10 cm) 1 cup (10 g) katsuobushi (bonito flakes) 1 tsp light soy sauce, or to taste 1 tsp mirin (optional) 1 tsp finely julienned fresh ginger 2 tsp yuzu juice (or lemon juice if unavailable) 1 tbsp dried wakame 6 oz / 170 g silken tofu, cut into 1 / 2-inch (1.25 cm) cubes 2 scallions, thinly sliced
Combine water and kombu in a pot and soak 20–30 minutes. Heat gently until small bubbles appear; remove kombu just before boiling. Add katsuobushi, turn off heat, and steep 5 minutes. Strain through a fine sieve or paper towel to yield a clear dashi. Return dashi to the pot. Stir in soy sauce and mirin. Add the ginger and warm 1 minute; do not boil. Add wakame and let it hydrate 2 minutes. Gently slide in tofu and warm on low heat until just heated through, avoiding a boil. Remove from heat and stir in yuzu juice. Taste and adjust seasoning with a few drops more soy if needed. Ladle into bowls and garnish with sliced scallions. Serve immediately alongside the spicy tuna roll.
Per serving | Servings: 2
Nutrition estimated: November 5, 2026
*Values are estimates based on USDA data and mathematical calculations. Actual values may vary. Where data are unavailable, those contributions are excluded. Calories, Carbohydrates, Protein, Fat and Sodium are known subtotals. Missing contributions are unknown, not zero.