Sweet and Sour Ground Beef

1 lb ground beef
16 oz frozen broccoli and carrots
1 T brown sugar
1/2 tsp ginger
1/4 tsp garlic powder
1/8 tsp pepper
8 oz can pineapple tidbits in its own juice, drained (reserve liquid)
2 T soy sauce
1 T vinegar
1 T cornstarch
2 T water
hot cooked rice

In large skillet, brown ground beef and drain. Stir in vegetables, brown sugar, ginger, garlic powder, pepper, reserved pineapple liquid, soy sauce and vinegar. Blend well. Bring to a boil; reduce heat. Cover, simmer for 4-8 minutes or until vegetables are crisp-tender. Stir in pineapple. In small bowl, combine cornstarch and water; blend until smooth. Gradually stir into hot mix in skillet. Cook, stirring constantly, until thickened. Serve over hot cooked rice.