Using a sharp knife, cut through the 2 wing joints; discard wingtips. Sprinkle chicken with a dash of salt and pepper. Broil 4-6 in. from the heat until golden brown, 6-8 minutes on each side. Transfer to a greased 5-qt. slow cooker. , Combine the ketchup, brown sugar, vinegar, Worcestershire sauce, mustard, garlic, liquid smoke if desired, and remaining salt; pour over wings. Toss to coat. , Cover and cook on low until chicken is tender, 2-3 hours. If desired, top with jalapenos, onion and sesame seeds to serve. Freeze option: Freeze cooled fully cooked wings in freezer containers. To use, partially thaw in refrigerator overnight. Reheat wings in a foil-lined 15x10x1-in. baking pan in a preheated 325° oven until heated through, covering if necessary to prevent browning. Serve as directed.