Watch your sauce portions to limit high sodium intake. Try using olive oil instead of vegetable oil to get monounsaturated fats.
To prepare oyster sauce, combine chicken broth through sesame oil in a small bowl. Set aside.
To prepare stir-fry, heat vegetable oil in a wok or large Dutch oven over high heat. Add onions, garlic, and ginger; stir-fry 10 seconds. Add mushrooms and 2 tablespoons sake. Partially cover, reduce heat to medium, and cook 4 minutes. Increase heat to high. Add oyster sauce; stir-fry 4 minutes or until mushrooms are tender. Serve over rice.