In a very large bowl, mix half the spice mix, 1 tbsp each of the pastes, three-quarters of the yogurt and some salt. Stir in the onion wedges, peppers and chicken, then leave to marinate overnight in the fridge.

Fry the chopped onions in the oil until really soft. Add the remaining spice mix and pastes, the coriander stalks and chilli powder. Cook for 1 min, then stir in 100ml water and the passata. Simmer for 15 mins, then add the coconut cream and remaining yogurt. Leave chunky or blitz with a blender.

Heat oven to 220C/200C fan/gas 7. Spread the chicken and veg on a baking tray. Roast for 15-20 mins until cooked and slightly charred. Tip into the sauce. Serve with rice, naan, extra yogurt and coriander leaves.