Gather the ingredients.
Add ¾ cup beef broth, 1 ¼ tablespoons oyster sauce, 1 teaspoon dark soy sauce, ½ teaspoon sugar, and 1 tablespoon cornstarch to a saucepan.
Mix evenly and make sure there are no lumps of cornstarch.
Bring it to a boil while stirring. Simmer until the sauce reaches the desired thickness.
