Roll the ground brisket and chuck into 4, 3.5oz balls (2 per burger).
Heat the grill to a hot temp.
Combine all spicy ketchup ingredients in a pan and heat over a low heat for a couple of minutes until the sugars are all dissolved, allow to cool.
Oil grill and place balls of mince on the hotplate, you should hear a sizzle as the meat touches the grill.
Season balls with a good sprinkle of kosher salt.
Flatten mince with a burger smasher, use baking paper to stop the smasher sticking to the patties.
Once fluid is visible on top of the burger patties, it’s time to turn them over.
Place a piece of American cheese on each patty and place burger buns on grill to brown.
Once cheese is melted, take buns off the heat.
Apply Kewpie mayonnaise to bottom buns.
Add two burger patties to bottom bun.
Apply mustard, ketchup and pickles to the top.
Add top part of bun.
Eat and enjoy!