Mix the harissa and wine vinegar into a slurry in a bowl. Add the meat and manipulate with your hands to ensure the marinade coats the chunks. Cover with cling film and marinate at room temperature for 2 hours.

Mix all the ingredients for the dip together and place in a bowl or bowls. Season to taste with the salt and pepper.

Soak the kebab sticks in water for at least 20 minutes. Thread the marinated steak on the skewers. Use a broiler / grill pan with a wire mesh. Spray the wire mesh well with Spray2Cook. Place the kabobs on the wire mesh and put the pan in the broiler / grill (set at high) 10 cm / 4 inches from the heat. Grill, turning to cook evenly, for approximately 8 minutes. Let the kabobs stand for 3 minutes. Serve with the mint yogurt sauce.

Alternatively grill on the BBQ for roughly the same amount of time but, as the heat varies, take care to ensure cooking is complete and do not allow charring.