Preheat the oven to 180 degrees Celsius.
Trim off any excess fat from the chicken and lightly score the surface with a knife. Mix the tandoori mix through the yogurt and pour over the chicken to marinate overnight.
Cook the chicken on a hot grill pan for 3 minutes each side then place in the oven for a further 15 minutes to cook throughout.
Serve with a green salad and cucumber and dill raita.
Note : If you do prefer to use fish buy a thick fillet eg ling, and sear the fish for 2 minutes each side before finishing off in the oven for a further 10 minutes.