Also known as Tikka Masala.
1 large fine chopped onion
Coconut oil (Ghee or butter will do)
Fry off the spices in the oil. (I also add the remnants of the tandoori marinade)
Add the onions until soft and starting to dry.
Add the juice from the tomatoes.
Finley chop the tomato pulp and add.
Add the lemon juice and let cook through.
Liquidise this mixture and then add the yogurt.
Bad picture sorry.