Chicken And Fresh Grapefruit Stir-fry

1 Grapefruit; peeled
8 oz Pineapple chunks
1 tb Cornstarch
1 ts Soy sauce; low sodium
2 Skinless boneless chicken breasts
1 md Clove garlic; minced
1/2 ts Vegetable oil
1/4 lb Snow peas; trimmed
2 Green onions; sliced diagonally

Peel and section grapefruit over bowl; reserve juice. Drain pineapple well, reserving juice. Combine juices and add enough water to equal 1 cup liquid. Combine with cornstarch and soy sauce. Rinse chicken breasts and pat dry; remove any excess fat. Cut into thin strips. In large non-stick skillet, sprayed with non-stick cooking spray, stir-fry chicken with garlic in oil over medium-high heat for 5 minutes, or until lightly brown. Add the snow peas and cornstarch mixture and cook, stirring until thickened. Add grapefruit, pineapple and green onions and cook until evenly heated.