Grapefruit Shrimp Stir Fry

1. In a large mixing bowl, mix cornstarch, cayenne, soy sauce and 1 tablespoon of the oil. Add shrimp, tossing to coat. Let stand for 15 minutes.

2. In large fry pan or wok, heat remaining 2 tablespoons oil. Add shrimp mixture and vegetables. Stir fry for 3 minutes over medium-high heat. Add grapefruit juice; cover and cook over low heat for 4 minutes. Add grapefruit sections and heat, covered, until grapefruit is heated, about 2 minutes.