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.
Santa Maria Umami Seasoning
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