Sweet and Sour Beef Recipe

1 lb ground beef
16 oz combination frozen broccoli carrot and cauliflower
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; 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.