Slow Cooked Chicken Shawarma

British Chicken Thighs (78%), Tzatziki Style Sauce (18%) (Greek Style Yoghurt (Cows' Milk), Water, Gherkins (Gherkins, Water, Spirit Vinegar, Sugar, Salt), Spirit Vinegar, Rapeseed Oil, Garlic Purée, Cornflour, Mint, Red Wine Vinegar, Lemon Juice, Stabiliser: Xanthan Gum; Black Pepper), Sugar, Garlic Powder, Cumin, Smoked Paprika, Salt, Cornflour, Black Pepper, Onion Powder, Coriander, Black Onion Seed, Cayenne Pepper, Ginger Powder, Cloves, Cinnamon, Lemon Juice Powder, Stabiliser: Guar Gum; Nutmeg, Acid: Citric Acid; Chilli Flakes, Star Anise, Parsley, Mint, Bay Leaf, Olive Oil, Lemon Oil, Pimento Extract, Coriander Extract.