 Toast until golden brown, 6 to 8 minutes, adjusting the heat if necessary. You want to do your best to time their completion to the burger cooking.</li>
<li>While the buns toast, cook the patties. Heat a cast-iron skillet or grill over high heat. Use a spatula to handle the patty—it will be loose, so be careful. Salt both sides of each patty and put them on the hot skillet. Cook on one side, about 1 minute, then flip the patties and cook until rare, another minute.</li>
<li>Place a patty on a bottom bun 