Cheesy Hamburger with Grilled Onions and Buns

Method

1. In a bowl, mix ground beef with ketchup and mustard
2. Form into 4 patties and cook on a grill or skillet until browned and cooked to desired doneness
3. Cook sliced onions on a grill or skillet until caramelized
4. Toast buns and assemble with cheese, lettuce, tomato, pickles, and grilled onions
5. Serve with a side of fries
6. Check that the ground meat reaches 71°C (160°F) throughout before serving.