1Cut thin slice from stem end of each bell pepper to remove top of pepper; discard. Remove seeds and membranes; rinse peppers.
2In 10-inch skillet, cook beef, onion and garlic over medium-high heat about 5 minutes, stirring occasionally, until beef is brown; drain. Stir in tomato sauce, cumin, salt, cinnamon and red pepper. Stir in couscous. Divide beef mixture evenly among peppers.
3Pour water into 4 1/2- to 6-quart slow cooker; stand peppers upright in cooker.
4Cover and cook on low heat setting 3 to 4 1/2 hours or until peppers are tender. Garnish with pine nuts and cilantro.