2 pounds 80/20 Ground Beef
1 large sweet onion, sliced
1/4 cup mayonnaise
1/4 cup ketchup
2 Tablespoons mustard
Salt and pepper
8 Brioche hamburger buns
Preheat griddle to medium heat.
Lightly form 80/20 ground beef into 1/4 pound balls. Do not hard pack the meatball. Set aside and keep cool.
Cut onion into rings or strings. Set aside.
Mix together mayonnaise, ketchup, and mustard. Set aside.
Mix together salt, pepper, and pinch of garlic powder. Set aside.
Once griddle is hot, place small amount of butter on the griddle and add onions. Sauté onions until translucent and golden brown. Add a pinch of salt.
While the onions are cooking, lightly toast the buns on the griddle. Remove when done.
Once onions are close to finished, butter the remaining space of the griddle. Place meatball on the griddle, and using a large, sturdy spatula, press down on the meatball until the patty is smashed thin on the griddle.
Once the edges are brown and grease is coming out of the meat, flip the hamburger. Add a pinch of salt/pepper/garlic powder, and top with cheese.
To build the cheeseburger, start with a spoonful of hamburger sauce on bottom bun, add a cheeseburger patty or two. Top with onions, pickles, and top half of the bun.