6 cups (1.4 L) water 1 piece dried kombu (4 x 4 inches) 4 dried shiitake mushrooms 2 stalks lemongrass, trimmed, outer layer removed, bruised 6 thin slices fresh ginger 8-10 white peppercorns, lightly crushed 1 tbsp (15 ml) low-sodium tamari or soy sauce 2 tsp (10 ml) rice vinegar (or 1 tsp / 5 ml yuzu juice, to taste) 2 small baby bok choy, halved lengthwise 6 oz / 170 g silken tofu, cut into 3 / 4-inch (2 cm) cubes 3 oz / 85 g enoki mushrooms, ends trimmed (optional) 1 tsp (5 ml) toasted sesame oil 2 scallions, thinly sliced (greens only) Fine sea salt, to taste
Combine water, kombu, and dried shiitake in a pot; soak 30 minutes to make a cold-brew base. Set over medium heat and slowly bring just to a bare simmer (do not boil). Remove kombu as soon as small bubbles appear around the edges. Add lemongrass, ginger, and white peppercorns. Simmer gently 15 minutes; do not boil to keep the broth clear. Strain the broth, pressing gently on solids; return clear broth to the pot. Season with tamari and rice vinegar (or yuzu). Taste and adjust salt as needed for a delicate, savory balance. Add bok choy and enoki; simmer 2-3 minutes until just tender-crisp. Slide in silken tofu and warm 1-2 minutes without boiling to avoid breaking. Remove from heat; swirl in toasted sesame oil and garnish with scallions just before serving.
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