Ingredients
1 1/2 lbs 80/20 ground beef divided into 8 equal balls.
salt and pepper to taste
oil
8 slices of American or cheddar cheese
Lettuce
Sliced tomato
2 sliced onions
4 burger buns
2 tablespoons of butter
3 cloves of garlic
2/3 cup mayonnaise
1/4 cup ketchup
3 tablespoons of mustard
1/4 cup chopped pickles

In a saucepan, over medium heat, add the butter. Once melted and hot, add the sliced onions. Season with salt and a pinch of sugar. Cook for 20 to 30 minutes over medium-low heat, stirring occasionally, until deeply caramelized. Then add the garlic and cook for another 1 minute. Keep warm.

In a small bowl, add mayonnaise, mustard, ketchup, pickles, salt and pepper. Mix well until combined. Put aside.

In a frying pan over medium heat, add the butter. Once melted and bubbling, toast your buns until golden brown on the cut sides.

In a cast iron skillet, over medium-high heat, once very hot and smoking, spray with oil. Then add two meatballs and crush them with a spatula until 1/3 inch thick. Season with salt and pepper and cook for 1 minute. Then turn over, season again, add a slice of cheese and cover with a lid. Once the cheese is melted, remove it from the pan.

To assemble, add the sauce to both buns. To the bottom bun, add the tomato, lettuce and two hamburger patties. Add your top bun and enjoy!

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