Grill your burgers over too high a heat and you’ll end up with dry, burnt burgers; too low and they’ll be placid and rubber. The sweet spot for grilled burgers is 375°F to 400°F, which for most gas grill is medium-high heat. For charcoal grills, make sure you fill the grill with two to three quarts of lit charcoal spread into an even layer. Make sure you’re preheating your grill long enough to ensure that both the grates and the interior of the grill are hot before you begin. Grill the burgers directly over the heat source (rather than cooking them over indirect heat).