Onion slices often come apart on the grill. Keep them together with the small metal pins used to close a turkey for roasting. Insert the pins at intervals through the whole onion. Cut between the pins to make your slices.
To broil onion and steaks, place on broiler pan; broil 4 to 6 inches from heat using times above as a guide, turning once and topping steaks with cheese during last minute of cooking time.