Korean Beef and Mushrooms

3 lb thin beef stakes cut off all fat and sliced thin
1 medium onion
3 Tbs mashed garlic
6 oz mushrooms, sliced
1 tsp ginger
2 tsp black pepper
1/3 cup sugar
½ cup soy sauce (light has less sodium)
3 Tbs soda (i.e. sprite)

Mix all the ingredients and let them sit in fridge for 2 hours. Cook in a frying pan until meet is fully cooked. Mix 1 T corn starch with 3 Tbs water add to mixture to thicken, simmer. Serve over rice.