Step 1

Using a small knife, make a cut in the side of the burgers to the middle, large enough to fit the cheese. Stuff 1 ball of mozzarella into each burger, then use your hands to re-shape the burger closed around the cheese.

Step 2

For the relish, use a food processor to coarsely chop the beetroot. Add to a saucepan with sugar, vinegar & seasoning and simmer over a low temperature until the liquid has evaporated.

Step 3

Heat the oven to 160°C. Place mushrooms on a lined baking tray, drizzle with olive oil, sprinkle with salt & pepper. Bake for 8 minutes, then cool.

Step 4

Heat a grill or frypan to a medium-hot heat. Grill the pita pockets quickly for 30 seconds each side.

Step 5

Rub the burger patties with a little oil, then grill the burgers for approximately for 8 minutes each side until fully cooked through.

Step 6

Cut open the pita halfway across the top. Fill with the cooked burger, mushroom, and a generous amount of beetroot relish, then finish with lettuce. Serve immediately.