How to Make It
Make a slash on the inside of the chicken wing joints without cutting through the bone and in a few other places. In a large, shallow baking dish, combine the ketchup with the mustard, hot sauce, soy sauce and brown sugar. Add the chicken wings and turn to coat. Cover and refrigerate overnight.
Light a grill. Remove the chicken wings from the marinade (pantry sauce), leaving some of it on them, and reserve the remaining marinade. Grill the wings over a medium-hot fire, turning and basting them with the reserved marinade, until nicely charred and cooked through, about 30 minutes. Stop basting during the last 5 minutes of grilling and discard any remaining marinade. Serve the wings hot or at room temperature.
A "pantry sauce" is one that can be made with ingredients, such as ketchup, mustard and soy sauce, that can be found in the home pantry.