Tofu Dengaku

Ingredients

• 3 tablespoons sake, divided
• 1/4 cup white miso
• 7 teaspoons sugar, divided
• 1/2 teaspoon finely grated yuzu peel (optional)
• 1 tablespoon chopped shiso leaf (optional)
• 1/4 cup red miso
• 4 cups water
• 1 3x5-inch piece dashi-kombu (dried seaweed)
• 1 cup dried shaved bonito flakes
• 1/3 cup light soy sauce
• 1/3 cup mirin (sweet japanese rice wine)
• 20 ounces extra-firm tofu, well drained
• 20 6- to 8-inch-long wooden skewers
• toasted sesame seeds