1Spray 5- to 6-quart oval slow cooker with cooking spray. Set oven control to broil. Spray broiler pan rack with cooking spray. Place ribs on rack. Broil with tops 5 1/2 inches from heat 10 minutes.
2Meanwhile, in medium bowl, mix remaining ingredients. Arrange ribs in slow cooker; cover with sauce.
3Cover; cook on Low heat setting 8 hours.
4Remove ribs from slow cooker to serving platter; cover to keep warm. Skim fat from cooking liquid in slow cooker. Pour liquid into 2-quart saucepan. Cook over medium-high heat 10 minutes, stirring occasionally, until reduced to 1 1/2 cups. Serve sauce with ribs.