When done on 1 side, flip when hamburger is almost done flip again and brush with barbecue sauce.
Note: I'm not sure the 1/2 barbecue sauce should be mixed in with the meat. Or you brush the 1/2 barbecue sauce on them at the end. The sugars could cause the burgers to burn if mixed inches The directions were a little confusing. If you make this before I please let me know how you handled the barbecue sauce issue.