1Remove fat from lamb. Cut lamb into 1 1/2-inch cubes. Mix remaining ingredients except couscous, mint and pepper sauce in glass or plastic bowl. Add lamb; stir to coat with marinade. Cover and refrigerate 4 hours.
2Set oven control to broil. Spray broiler pan rack with cooking spray. Remove lamb from marinade. Place lamb on rack in broiler pan. Broil with tops 5 inches from heat 6 minutes; turn. Spoon pan drippings over lamb. Broil about 7 minutes longer or until no longer pink in center.
3Mix couscous and mint. Serve lamb over couscous. Serve with pepper sauce.