Beef Stir Fry Recipe

Beef Stir Fry Recipe Ingredients: For the Marinade: 1/4 cup soy sauce 1 tablespoon cornstarch 1 tablespoon vegetable oil 1 tablespoon oyster sauce (optional) 2 teaspoons rice vinegar 1 teaspoon sugar 1 teaspoon freshly grated ginger 2 cloves garlic, minced For the Stir Fry: 1 pound beef (such as flank steak or sirloin), thinly sliced against the grain 2 tablespoons vegetable oil 1 red bell pepper, sliced 1 green bell pepper, sliced