Be careful if you are freezing a Jalfrezi because the green peppers will take on a very bitter taste if frozen, dont know why because if you freeze green peppers on their own you dont get the bitterness (might be because it has been heated through).
I have frozen say just the sauce for a Jalfrezi and put the chicken (raw) into the sauce and frozen it, but i always put the other ingredients ( onion, pepper and green chilli) when i reheat the curry, fresh or pre-fried. Have also done this with Chicken Tikka made the marinade placed chicken in marinade then frozen in freezer bags, then just defrost when needed.
But has Phil said it is better cooked from fresh. Pre-cooked chicken/meat is the way forward for easy and fast way of cooking a curry which alot of restaurants do anyway.
The way i see it is, Would you buy a curry thats been frozen and just reheated or would like it prepared fresh on the premises?