Step 1

Heat up a cast iron (or flat top skillet) on high.

Step 2

While it’s heating up, gently divide the mortadella into 3 piles - clumping and folding each piece on top of the other - making sure that there are air pockets between the slices.

Step 3

Once you’ve got the mortadella piles ready and and the cooking surface is super hot, quickly add the oil and place the stacks of meat on top.

Step 4

Let the meat brown and caramelize for about a minute or so then flip each pile and add a slice of cheese on top. Once the bottom layer of meat is crispy, pile the meat and cheese stacks on top of each other and toast the bun directly in the pan — moving them around to soak up any excess oil.

Step 5

Once the buns are warm and toasty remove it from the heat. Add a smear of mayo to the bottom bun then place the meat and cheese stack on top. Smear the mustard on the top half of the bun and then close up the sandwich.

Step 6

Slice it down the middle and serve immediately.