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.
Heinz Mayonnaise Jar
Heinz Tomato Ketchup Jar
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