Place raspberries in a blender; cover and process until pureed. Strain and discard seeds; transfer puree to a small saucepan. Stir in the cucumber, apple, grape juice and sugar. Bring to a boil. Reduce heat; simmer, uncovered, for 5-7 minutes or until cucumber and apple are tender., Meanwhile, in a large skillet, saute garlic in oil until tender. Add lamb chops. Cook, uncovered, for 7-10 minutes on each side or until meat reaches desired doneness (for medium-rare, a thermometer should read 135°; medium, 140°; medium-well, 145°). Serve with raspberry sauce.