- Freeze the steak for 30 to 45 minutes until firm, then slice it as thinly as you can.
- Heat 1 tablespoon oil in a large skillet or griddle over medium heat. Cook the onion, stirring, until soft and golden, 8 to 10 minutes. Push to one side or set aside.
- Turn the heat to high and add the remaining oil. Spread the steak in a single layer, season with salt and pepper and sear 1 to 2 minutes.
- Chop the steak with two metal spatulas and cook until no pink remains, 2 to 3 minutes. Mix in the onions.
- Divide the meat into 4 long piles. Lay 2 slices of provolone over each and let melt, about 1 minute.
- Place an open roll face-down on each pile, slide a spatula underneath and flip the whole thing into the roll. Serve hot.