Stir together chutney, margarine, lemon juice, water and pepper. Cook until margarine melts and mixture bubbles; stir occasionally. Remove from heat and keep warm. Cook rice. Add turmeric to the cooking water. Preheat broiler. Place turkey on unheated rack. Brush turkey with the 1 tablespoon melted margarine. Broil 4 inches from heat for 4 minutes. Turn turkey and broil until no longer pink. Place rice on a platter. Serve turkey on rice topped with warm sauce. Garnish with cashews, grapes and onion.