In a bowl, combine half the yogurt with the spices, half the garlic, the lemon zest and 1/2 tsp salt. Tip in the chicken and stir well to coat. Cover and leave to marinate in the fridge for at least 30 mins or overnight.

Mix the grated cucumber and the remaining garlic into the remaining yogurt, then season with a pinch each of salt and pepper. Set aside in the fridge.

Mix the finely chopped cucumber and lettuce together, then squeeze over one of the lemon halves and season with a good pinch of salt. Cut the remaining lemon half into quarters. Heat the grill to high or a large griddle pan over a high heat.

Thread the marinated chicken pieces onto metal skewers, put on a tray and cook under a hot grill or in the griddle pan for 10-12 mins, turning often to ensure it cooks evenly and is charred in places. Warm the flatbreads under the grill or in a toaster.

Serve the chicken in the flatbreads with the chopped salad and cucumber yogurt. Drizzle with hot sauce before serving, if you like.