Mix the ketchup, Worcestershire sauce, vinegar, sugar and mustard together. Put the chicken on a foil-lined baking sheet or grill rack, then brush with the ketchup mixture.
Cook the chicken wings under a preheated grill or on a barbecue for about 15 minutes, turning once or twice until a deep brown and the chicken is cooked through. Test the chicken (see
Meanwhile, mix all the slaw ingredients together in a bowl, then spoon into a bowl. Put the chicken wings on to a plate and serve with plenty of paper napkins for sticky fingers.