Umami Bomb Mushroom-Swiss Burger

Instructions

1. 1

   Thinly slice the yellow onion. In a large frying pan, heat 15 ml of olive oil over medium-low heat. Add the sliced onions and a pinch of salt. Cook, stirring occasionally, for 25-30 minutes until they are deeply golden brown and caramelized.

   ~30 min
2. 2

   While onions are caramelizing, prepare the burger patties. In a bowl, combine the ground beef, Worcestershire sauce, soy sauce, garlic powder, onion powder, 2 g of salt, and black pepper. Gently mix to combine without overworking the meat. Form the mixture into 4 equal patties.

   ~5 min
3. 3

   Slice the shiitake mushrooms. In a separate frying pan, melt the butter over medium heat. Add the sliced mushrooms and cook for 5-7 minutes until they are tender and slightly browned. Season with a pinch of salt and pepper.

   ~7 min
4. 4

   Preheat your grill to medium-high heat (or heat the remaining 15 ml of olive oil in a clean frying pan). Cook the patties for 4-5 minutes per side for medium doneness, or to your desired preference. During the last minute of cooking, place a slice of Swiss cheese on top of each patty to melt.

   ~10 min
5. 5

   Lightly toast the brioche buns on the grill or in a dry frying pan for 1-2 minutes until golden brown.

   ~2 min
6. 6

   Assemble the burgers: Place a lettuce leaf and a tomato slice on the bottom half of each toasted bun. Top with a cheese-melted patty, a generous spoonful of caramelized onions, and sautéed mushrooms. Add pickles and cover with the top bun half.

   ~3 min