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Turn on the grill to high. Line a baking tray with foil, then place the meatloaf slices on it. Cover with the tomato and cheese, and grill until the meatloaf is hot and the cheese has melted.
Warm the burger buns in the toaster or under the grill. Mix the mayo and harissa, then spread over the bottom half of the buns, arranging the lettuce and cucumber on top. Add the slices of meatloaf, then top with the onion, a twist of black pepper and bun tops.
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