Five Napkin Burger

Divide ground chuck evenly into 6 portions. Using a 4-inch ring mold, evenly pack one portion of the chuck into ring mold to create a 3/4-inch thick patty. Repeat process with remaining chuck.

Preheat a cast-iron skillet or grill pan over high heat. Place burgers on skillet and cook, turning once, until medium-rare, about 4 minutes per side. Top each burger with two slices of cheese and continue cooking until melted.

Place burgers on the bottom half of each bun and top with onions and 1 heaping teaspoon aioli each; top with remaining bun halves and serve immediately.