Classic Cheeseburger with Caramelized Onions

Method

1. Heat a skillet over medium heat and add olive oil.
2. Add red onion slices and sugar, then cook until caramelized (about 10-12 minutes).
3. In the same skillet, cook the ground beef until browned and cooked through.
4. Place a slice of cheddar cheese on each patty and let melt.
5. Toast the hamburger buns and assemble the burgers with onions, cheese, and beef.
6. Check that the ground meat reaches 71°C (160°F) throughout before serving.