1 1/2 pounds ground beef (80/20 is best) 1 teaspoon Kosher salt 1/2 teaspoon cracked black pepper 1 white onion, thinly sliced 4 tablespoons butter, divided 4 slices American cheese 4 buns Season the meat with salt and pepper and mix to combine. Divide the ground beef evenly into 3-ounce portions and form into balls….