A nice tasty recipe:

MARINATED BEEF WITH OYSTER SAUCE
8 oz. lean steak, cut into thin strips
1 Tbs. soy sauce
1 tsp. sesame oil
2 tsp. dry sherry
1 tsp. powdered sugar
2 tsp. hoisin sauce
1 garlic clove, crushed and chopped
1/2 tsp. cornstarch
2 Tbs. soy sauce
1 tsp. powdered sugar
1 tsp. cornstarch
3 Tbs. oyster sauce
8 Tbs. water
2 Tbs. peanut oil
3 garlic cloves, crushed and chopped
1/2-inch piece ginger, grated
10 baby corn cobs, halved
1/2 green bell pepper, sliced
cooked rice

Place the steak in a shallow dish. Whisk together 1 Tbs. soy sauce, sesame oil, sherry, 1 tsp. powdered sugar, hoisin sauce, 1 clove garlic, and 1/2 tsp. cornstarch. Pour over meat, toss, and marinate at least one hour.
To make sauce, stir together 2 Tbs. soy sauce, 1 tsp. powdered sugar, 1 tsp. cornstarch, oyster sauce, and water. Set aside.
Heat oil in a wok. Add steak and marinade and stir-fry for about 3 minutes, until sealed and lightly browned. Add 3 cloves garlic, ginger, baby corn, and green pepper. Stir in oyster sauce mixture and bring to a boil. Reduce heat slightly and cook 3 minutes or until sauce firms up slightly.
Serve over rice.