Mabo Dofu

INGREDIENTS

• 1 tablespoon sesame oil
• 1 (1/2 inch) piece fresh ginger, minced
• 1 clove garlic, minced, or more to taste
• 1/2 pound ground pork
• 2 teaspoons chili bean sauce (toban djan)
• 1 tablespoon soy sauce
• 2 tablespoons sake
• 2 teaspoons oyster sauce
• 1 (12 ounce) package tofu, cut into 1/2-inch squares
• 1/2 cup water, or more if needed
• 1 small green onion, chopped