Crock-pot Sweet and Sour Chicken

4 tablespoons butter, melted 3/4 c. ketchup 1/2 c. white vinegar 3/4 c. brown sugar 3 tablespoons Worcestershire sauce 2 cloves garlic, minced salt and pepper, to taste dash red pepper flakes or ground cayenne pepper 1 1/2 c. chicken broth 6 boneless chicken breast halves, skin removed 1 can (8 ounces) pineapple chunks, drained Preparation: Wash chicken; pat dry. Place chicken in slow cooker. Combine melted butter, ketchup, vinegar, brown sugar, Worcestershire sauce, minced garlic, salt and pepper, hot pepper, chicken broth, (I also added a shake or two of ground ginger); pour over chicken. Cover and cook on LOW for 5 to 7 hours, until chicken is tender but still moist. Add pineapple and cook for 20 minutes longer. Serves 6.