1. Set the diced onions into the bottom of a 6–7 quart slow cooker. Cut the rack of ribs in half and place on top of the onions. Mix together the garlic, barbecue sauce, ketchup, honey, and 1 cup water in a bowl until well combined. Pour over top of ribs. Set slow cooker to low and cook for 4 hours or until fork tender.
2. Set grill to high heat. Use tongs to transfer ribs from slow cooker to a plate and pour the sauce from the slow cooker into a bowl. Skim the fat off the sauce. Grill ribs for 10–15 min., brushing with the barbecue sauce and flipping often, until slightly charred. Serve with any remaining sauce on the side.
Per serving: 674 calories, 45g fat, 22g saturated fat, 125mg cholesterol, 810mg sodium, 34g carbohydrate, 1g fiber, 27g sugar, 32g protein