Hot Tofu with Mushroom Sauce

Name: Hot Tofu with Mushroom Sauce
Ingredients: 500 g Tofu *medium soft type such as ‘Momen’, cut into large bite-size pieces; 200 g Asian Mushrooms *cut into small pieces or slices; *Note: Today I used Shiitake, Enoki and rehydrated Snow Fungus. Other suggestions include Shimeji, Oyster Mushroom, Black Fungus, etc; 1 tablespoon Potato Starch OR Corn Starch *mixed with 1 tablespoon Water; 1 Spring Onion *finely chopped; Salt & White Pepper; 1 cup Chicken Stock *OR 1 cup Water and 1 teaspoon Asian Chicken Bouillon Powder; 1 teaspoon grated Ginger; 1 tablespoon Soy Sauce; 1 tablespoon Oyster Sauce; 1 teaspoon Sesame Oil