My way of doing burgers is to fire up about 3/4 chimney of charcoal then put the hot coals on one side of the grill. I put the burgers on the other side and cook indirect for 3-6 minutes depending on the thickness of the burgers and the outside temps. I then take the lid off, stoak the coals, and let them get nice and hot again, about 3-4 minutes. Then the burgers go over the coals for about 2 minutes on each side. The fat dripping off the burgers flames the coals and the burgers have some nice color and marks.