Season the beef fully with salt and pepper on both sides, then thoroughly coat with flour
Dip beef into the beaten egg and then coat with panko breadcrumbs
Deep fry in hot oil (200°C) for 40 seconds on one side, then repeat for 40 seconds on the other side
Spread the butter and mustard evenly over the slices of toasted bread, then place lettuce on top. Top with tartar sauce
Place beef on top followed by evenly spread Tonkatsu sauce, tomato slices and sliced onions.
Complete by topping with the second slice of bread.
To make the perfect Wagyu Sandwich, browse Tom Hixson of Smithfield’s range of Wagyu beef today to find your ideal cut.