If your air fryer has a mesh basket or one with holes, use an enamel dish or baking dish that will fit into the air fryer. Oil the dish well. If your air fryer has a flat-sided basket, oil the base and sides.

Tip all the ingredients into a large bowl and mash well with your hands. Season with salt and lots of pepper. Pack the mixture into the dish or air fryer and smooth out the top.

Roast at 180C for 25-35 mins (depending on how deep the mixture is) until a metal skewer comes out piping hot when inserted into the middle, or when a cook’s thermometer reaches 70C, and the top is golden. Cover with foil for the last 15 mins if the top is browning too much.