2 lbs round steak or sirloin tip steak, cut into 2-inch strips (see notes below)

1 tsp. garlic powder

2 tbsp. vegetable oil

1 beef bouillon cube

1/4 cup hot water

1 tbsp. cornstarch

1/2 tsp. red pepper flakes

1 large green pepper, cut into strips

1 large red pepper, cut into strips

1 small yellow onion, sliced

1 can stewed tomatoes, with liquid

3 tbsp. teriyaki or soy sauce

1 teaspoon white sugar