This is the exact recipe from The Asian Vegan Kitchen and you NEED to go buy this AWESOME book RIGHT NOW!!
"8 cakes koyadofu, about 6 ounces (170g) in total
All-purpose flour for dusting
1 C (125g) all-purpose flour
1/2 C (120 ml) water
1 C (100g) breadcrumbs (panko)
Vegetable oil for deep frying
Shredded white cabbage, for garnish
Lemon wedges, for garnish
2 C (480 ml) dashi stock
2 Tablespoons soy sauce
1 Tablespoon mirin
1/2 inch (1 cm) cube fresh giner, peeled and grated
1/2 teaspoon grated garlic
1. Soak the koyadofu cakes in hot water for 10 minutes, then drain.
2. In a saucepan use a large pan!!, combine the simmering sauce ingredients and bring to a boil. Put in the drained koyadofu and simmer for 8-10 minutes over medium heat, until all the liquid is absorbed.
3. Dab the koyadofu in the dusting flour. Mix 1 cup flour and 1/2 cup of water to make a thick paste. Dip the floured koyadofu in the flour-and-water paste, then roll each cake int he bread crumbs. Set aside.
4. Heat the oil for deep-frying to 350F (180C). Slide the breaded tofu pieces into the oil in batches and deep-fry until crisp and golden brown. Drain on kitchen paper and serve hot with shredded cabbage, lemon wedges, and tonkatsu sauce."