Preheat the oven to 180c fan and the grill to high.
Chuck the onion, garlic, parsley into a food processor and blitz until fine. Add the chicken, tomato puree, sumac, Turkish pepper flakes, smoked paprika, Baharat and loads of salt and pepper. You want about 1 tsp of pepper so you can really taste it. Blitz until combined. If you are using mince, just add everything to the mince.
Line and oil a 24x32 baking sheet and add the chicken spread out evenly and then shape into 8 kebabs. Drizzle over the oil and pop into the oven for 6 minutes to start them cooking. Place them under the grill for 5-6 minutes or until cooked through and a little golden on top.
Meanwhile, to make the yogurt sauce, mix everything together with a pinch of salt. Toss the salad, too the onions together with the parsley, sumac, lemon and a pinch of salt.
To serve, layer everything up onto to a flatbread and serve immediately.
