3 1/2 tablespoons soy sauce, divided
4 teaspoons Asian sesame oil, divided
3 1/2 teaspoons unseasoned rice vinegar, divided
1 14- to 16-ounce container extra-firm tofu, drained
2 tablespoons peanut oil
4 green onions, chopped
1 tablespoon finely chopped peeled fresh ginger
2 garlic cloves, finely chopped
4 baby bok choy, leaves separated
12 cups loosely packed mizuna (about 8 ounces)
Ingredient info: Mizuna is sold at some supermarkets and at Asian markets