Heat the oven to 200C/180C fan/gas 6. Line a baking tray with foil and drizzle with a little oil. Arrange the meatballs over the tray, spaced apart, and squash into flat patties using the palm of your hand. Turn the patties over and rub in the oil, then bake for 15 mins.

Meanwhile, top the base of each roll with a small lettuce leaf. Halve the cheese slices lengthways in a zig-zag to make ‘teeth’, then cut in half again crosswise so you have eight rows. Cut the cucumber into thin slices on the diagonal to make tongues. Push a cocktail stick into each of the cornichons, lengthways, to make the horns and halfway through the olives to create the effect of eyeballs on stalks.

Add a burger patty to each of the lettuce-lined buns, followed by a cucumber tongue, cheese teeth and drizzle of ketchup, then sandwich with the tops of the buns. Stick the olive eyes and cornichon horns into the tops of the buns.