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.
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