Step 1

Divide the beef into two equal sized 70g balls.

Step 2

Place your pan over high heat and add the meat balls. Press these down in the pan so that they are quite thin.

Step 3

Season generously with salt and pepper and then fry over high heat for about two to three minutes until about 80% cooked through..

Step 4

Spread one teaspoon of the mustard on the rare side and then flip over.

Step 5

Place a piece of cheese (if using) on top of each burger and cook for a further two minutes. Then flip one last time so that the cheese is on the grill for about 30 seconds. Remove and keep warm.

Step 6

Working quickly, spread the special sauce over the bottom bun followed by the pickles and tomato.

Step 7

Now stack one of the burgers on top of the tomato.

Step 8

Top this burger with the onion slice and then the other burger.

Step 9

Place one or two slices of thick iceberg lettuce on top and enjoy.