1Spray 5- to 6-quart slow cooker with cooking spray. Set oven control to broil. Spray broiler pan rack with cooking spray. Place half of the drummettes on rack in pan. Broil 3 inches from heat 20 minutes, turning after 12 minutes, or until lightly browned. Transfer drummettes to slow cooker. Repeat with remaining drummettes.
2In medium bowl, mix soy sauce, vinegar, molasses, orange juice, chili paste and brown sugar. Pour sauce over drummettes; toss lightly to coat with sauce.
3Cover; cook on Low heat setting 3 hours. Remove drummettes from slow cooker to serving platter. Pour sauce into 1-quart saucepan; heat to boiling over medium-high heat. Cook until thickened and reduced by half, about 10 minutes. Drizzle sauce over drummettes. Sprinkle with onions and sesame seed.