Make the special sauce

• Mix the mayonnaise, sweet gherkin, mustard, tomato sauce, white vinegar, paprika, garlic powder, onion powder, salt and sugar in a bowl.
• Chill in the fridge.

Prepare the toppings

• Finely shred the iceberg lettuce, the thinner the better.
• Finely dice the onion and slice the dill pickles.
• Keep the toppings chilled in the fridge.

Heat the griddle

• Preheat the cast iron griddle over medium heat until it starts to smoke.

Smash the patties

• Place the beef balls on the griddle and smash them flat.
• Hold for 5 seconds and twist the spatula off.
• Season with salt, scrape the patties off and top with American cheese.
• Repeat with the second patty.

Prepare the buns

• Cut an extra bun heel in half to create the middle bread layer.
• Toast the three bun pieces.

Assemble the burger

• On the bottom bun, spread special sauce, then add diced onion, shredded lettuce and pickles.
• Add a beef patty, then the middle bun with more sauce, onion, lettuce and pickles.
• Top with the second patty and the top bun.