Light a lidded barbecue, then let the flames die down. Once the coals have turned ashen, mound them up on one side. Thread the chicken thighs onto 2 metal skewers – so that both skewers go through each piece of meat – packing the thighs down so that they are really compact. Place the chicken kebab on the side without any coals underneath. Pop the lid down and cook for 45-55 mins, turning regularly, or until cooked through – prise the chicken pieces apart in the centre to check this. Cover the chicken with foil and leave to rest for 20 mins before slicing. (If cooking in the oven, heat to 200C/180C fan/gas 6. Rest a wire rack over a roasting tin and place the chicken on top. Cook for 45-55 mins or until cooked through.)