Grilled Chicken Breasts with Green Grape Sauce

2 Chicken breasts 1/2 c Grapes; green seedless, hal 1/4 ts Freshly ground black pepper -ved Sauce: 1 tb Sherry 1 c Green onion; chopped 1 tb Red currant jelly 1/4 c Celery; minced 1/8 ts Thyme 1 Cl Garlic; minced Freshly ground black pepper 1 tb Dry blond roux -to taste 1/2 c Water Preheat the charcoal grill. MAKE THE SAUCE: In a heavy saucepan cook the green onion with the celery and garlic over medium heat, stirring, until they have rendered their liquid. Stir in the roux and cook while stirring for 1 minute more. Add remaining sauce ingredients and simmer for 20 minutes. Meanwhile, rub the chicken breats with the 1/4 teaspoon pepper. Grill the chicken over charcoal for approximately 12 minutes, turning once. TO SERVE: Serve each person one chicken breast with the Green Grape Sauce spooned over.