A smash burger cooked directly onto a flour tortilla. The tortilla goes on top of the beef while it is still on the griddle, gets pressed down, and the two fuse into one thing.

Twenty minutes for four of them, and no oven involved.

The tortilla does the smashing

This is the part that makes the whole idea work.

You drop loose portions of beef onto a hot griddle, cook them two minutes, then lay a tortilla over each one and press down firmly until the beef spreads out to the edges of the tortilla.

The tortilla acts as your barrier. Instead of pressing metal onto meat, you press through the tortilla, which means the beef bonds to it as it flattens. The juices and rendered fat go straight into the tortilla rather than onto the griddle. By the time you flip it, they are a single piece.

Loose portions, not formed patties

Divide the beef into four loose portions and put them down as they are.

Do not roll them into balls, do not pack them, do not shape them. Compressed beef will not spread properly under pressure and it develops a dense chewy texture. A loose mound of ground round flattens into a thin patty with rough irregular edges, and those edges are where the crisp bits come from.

Season after they hit the griddle rather than mixing salt into the beef. Salt worked into raw ground meat draws out moisture and firms the protein.

Get the griddle properly hot

Medium-high, and give it time to come up before anything touches it.

The whole point of a smash burger is the crust that forms where beef meets hot metal. A lukewarm surface means the beef releases its liquid and simmers in it, and you get grey meat with no crust at all.

Ground round at around eighty five percent lean is the right choice. Enough fat to crisp the edges and lubricate the griddle, not so much that it floods the surface.

The sauce is standard and it should be

Mayonnaise, ketchup, mustard, relish and hot sauce stirred together in a small bowl.

This is a burger sauce and there is no reason to reinvent it. Make it first and set it aside, because the cooking moves fast once the griddle is hot and there is no time to be measuring condiments halfway through.

Cheese goes on after the flip

Cook until the tortilla is golden brown, two to three minutes, then flip the whole thing over and lay the half slice of American cheese onto the beef.

American cheese melts smoother than anything else because of the emulsifying salts in it, and on a surface this hot you want something that goes liquid rather than oily and stringy. Cheddar splits.

Ground beef should reach 160F to be safe, which is easy to overshoot on a patty this thin, so work quickly once it goes down.

Six inch tortillas, not larger

Size matters more than it looks like it should. A pound of beef divided into four means each portion has to spread to fill its tortilla completely, and a six inch flour tortilla is exactly the right target.

Go bigger and the beef will not reach the edges, so you get bare tortilla around the rim that stays floppy while the middle crisps. Flour rather than corn, since corn tortillas crack rather than fold.

Building and eating

Once the cheese has melted and the tortilla is crisp and golden, top with shredded iceberg and diced onion, drizzle the sauce over, then lift it off the griddle and fold it in half like a taco.

Serve immediately. The tortilla is crisp for about ninety seconds before the sauce and the residual heat soften it. That crisp window is the whole appeal, so cook these when everyone is already sitting down.

Cooking more than four

Work in batches rather than crowding the griddle. A crowded surface drops in temperature and the beef steams instead of searing. Keep finished tacos warm in a low oven, accepting that they lose some crispness.

Iceberg specifically

Shredded iceberg is the right lettuce here and not a compromise. It is watery and crunchy and cold, which is exactly the contrast a hot fatty beef and cheese taco needs. Softer leaves wilt on contact.