Hamburger with Caramelized Onions and Cheddar

Method

1. Preheat grill or skillet to medium-high heat.
2. Form ground beef into 4 equal patties, season with salt and pepper.
3. Cook patties for 4-5 minutes per side, until desired doneness.
4. In a skillet, heat olive oil over medium heat. Add onions, cook until caramelized, about 10-12 minutes.
5. Toast buns. Assemble burgers with cheese, patty, caramelized onions, lettuce, tomato, ketchup, mustard, and mayonnaise.
6. Check that the ground meat reaches 71°C (160°F) throughout before serving.