How to Make It
Freeze the meat in a single layer on a parchment-lined baking sheet until firm, 30 minutes.
In a grinder fitted with a chilled medium plate, gradually add the meat slices and grind at medium-high speed into a chilled bowl; do not force it. Working quickly, gradually re-grind the ground meat, pushing gently only if necessary.
Light a grill or preheat a grill pan. Form the meat into eight 3/4-inch-thick patties. Generously season with salt. Grill over high heat until browned outside and medium-rare within, 3 to 4 minutes per side. Serve the burgers in buns with ketchup, mustard, lettuce and tomato.