Preheat broiler. Line bottom portion of broiler pan with foil for easy clean up. Spray top rack lightly with cooking spray.
Season ribs with garlic salt and pepper. Broil for 5 to 6 minutes, turn and broil for an additional 5 to 6 minutes. Place browned ribs in slow cooker.
In a mixing bowl, stir together remaining ingredients. Pour sauce mixture over ribs. Move ribs around to make sure they are all coated. Cover and cook on High setting for 3 to 4 hours or Low for 8 hours.
With tongs, remove ribs from slow cooker and let cool slightly before cutting into individual rib pieces. Skim grease from sauce. Serve ribs with sauce on the side.