Cook 1/3 pound burgers on a preheated grill or grill pan over high heat (about 450°F) for 2-3 minutes on EACH side, until golden brown. Do not push down on the burgers while they cook. Then, move to a lower heat area of the grill and cook to desired doneness, another 3-4 minutes (for medium) or 5-6 minutes (for well-done).