Form beef into eight 4"-diameter, 3/4"-thick patties (don't pack too tightly). Using your thumb, make a small indentation in centers to help keep patties flat as they cook.
Prepare grill for medium-high heat. Season patties with salt and pepper and grill until lightly charred on bottom, about 4 minutes. (Resist the temptation to press down on patties.) Flip and top with cheese, if using. Grill patties to desired doneness, about 4 minutes longer for medium.
