Umami Burger

1. Sprinkle the beef mince evenly with Umami and ground black pepper in a large bowl; mix with your hands until the ingredients are well blended. Gently form the meat into 4 balls, and then lightly press into 4-inch wide, 1-inch thick patties. Cut the shiitake mushrooms into 1-cm thick slices. 2. Fry the patties in butter on a medium heat. Then fry the mushrooms for a few minutes until golden. 3. Serve the burgers in buns with tomato sauce, red onion, mayonnaise, romaine lettuce, parmesan crisps, tomatoes and the mushrooms.