Cut tofu into 3/4 inch squares, lightly salt, add cornstarch and toss.
For the sauce add 1/2 cup vegetable stock, 1 Tablespoon dark soy sauce, 1 Tablespoon soy sauce, 1/2 Tablespoon hoisin sauce, 1 teaspoon black vinegar, 1 teaspoon raw sugar. 1 teaspoon sesame oil. to a bowl mix and have it ready when your cooking.
Mince 2 cloves garlic, 1/2 Tablespoon ginger, 2 stalks green onion, 1/2 cup bell pepper. If using prepare 5 dried chili peppers or sriracha.
In 1/4 inch of oil fry the tofu on medium heat until it forms a crust on all sides
To the nonstick pan on medium heat add 1/2 Tablespoon of oil. When the oil is hot add the vegetables / aromatics. Cook for 1 to 2 minutes to cook the ginger and garlic.
Add the sauce and bring to a boil
After the sauce comes to a boil add the tofu and keep tossing until the tofu soaks up most of the sauce.