Unroll lamb and trim any excess fat. Make 1-inch slits with knife all over lamb. Combine lemon juice, oregano, garlic, salt and pepper in a small bowl and rub over all sides of lamb and into slits. Place lamb in resealable plastic bag; add cranberry-pomegranate juice and place in 13x9inch pan. Refrigerate 4 to 24 hours, turning occasionally. When ready to bake, heat oven to 450°F. Line rimmed baking sheet with foil; place a wire rack over pan. Spray rack and pan with cooking spray. Remove lamb from marinade; discard marinade. Blot lamb dry with paper towel; brush with olive oil. Place on wire rack. Bake 20 to 30 minutes or until internal thermometer reaches 132°F for medium rare in the thickest part. Makes 6 servings