Stir-Fried Bok Choy and Spinach with Tofu

Ingredients

• 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)
• 1/2 lb spinach ((or 1/2 lb mustard greens))