In a small non stick pan, dry roast the cumin and coriander seeds until they smoke.
Using a mortar and pestle, grind the cumin, coriander seeds and chilli into a powder
Add the ginger, garlic, rock salt and grind to a paste.
Prick the chicken all over with a fork, then place the chicken in a bowl and coat with the lemon juice.
Add the paste, coriander powder, paprika, and fresh yoghurt.
Mix everything well then cover with cling wrap and marinate in the fridge for at least 6 hours, ideally overnight.
Cook chicken on a BBQ or under the grill