Grill on High
For burgers, you want high heat. Prior to cooking, grease the grill grates. I like to use a little melted ghee on a paper towel, but any high-heat oil will do.
If you're using a gas grill, turn on high, cover, heat for 15 minutes prior to cooking, and remain on high when cooking.
For a charcoal grill, light about four quarts of charcoal, let it burn until the exterior becomes ashy, then close the lid, open the lid vent entirely, and heat for five minutes before throwing on the burgers.
Just before cooking, liberally salt the exterior of the burgers. Throw the burgers on the grill using a spatula. If using a charcoal grill, place them directly over the coals.