Step 1

Dice yellow onion, slice tomatoes, and shred lettuce. Set aside until needed.

Step 2

Spread ½ tablespoon of butter on the inside of each hoagie roll. Grill in a large skillet until golden brown. Plate until needed.

Step 3

Divide the meat into four 6-ounce portions and shape each portion into an oval. Season generously on both sides with salt and pepper. Place one portion into a hot cast-iron skillet and smash with the back of a spatula (similar to smash burgers). Cook over medium high heat for a few minutes.

Step 4

Flip the flattened patty to the other side and top with a quarter of the diced onions. Now begin chopping the burger patty as you mix in the onions. Continue doing this for a few minutes until the meat has crispy edges and the onions are grilled.

Step 5

Top meat with 2 American cheese slices. Turn off the heat and allow the cheese to melt.

Step 6

Slather mayo and ketchup on the toasted hoagy roll. Add the patty and top with shredded lettuce and sliced tomatoes. Season with salt and pepper and serve.