Sunny-Side-Up Burger with Caramelized Onions

Method

1. Heat a skillet over medium heat and add a pat of butter.
2. Add sliced onion and cook until caramelized, about 10-15 minutes.
3. Form ground beef into a patty and season with salt and pepper.
4. Cook the patty on the skillet until desired doneness, about 3-4 minutes per side.
5. Toast the bun and assemble the burger with lettuce, tomato, patty, caramelized onions, egg, and condiments.
6. Check that the ground meat reaches 71°C (160°F) throughout before serving.