The colour paste is a restaurant method. A blend of mustard oil, kashmiri paste, yoghurt, and lots of red food colour powder. A tiny amount can be used to singe colour into the edges of sliced onions. Very effective if done right; very tricky to do. The paste can also be used to intensify the colour of a curry late on, if wanted. It's a better option than using tomato paste with/without additional food colour, as adding this late can taint the flavours of the final dish.
I have also seen a mix of mustard oil/kashmiri paste used for tikka starters. Some TAs (I expect many) pre-cook chicken and lamb tikka. No real problem when used to make a curry. But when re-heating a tikka starter in the microwave, as many of already know, there is a risk of overdoing it, and it ending up dry and chewy. Addition of a little of the paste before the micro gets around this, producing lovely juicy tikka. As it's been too hot to do much cooking lately I have been getting chicken/lamb tikka from my local TA. I bring it home cold (no micro) and use it to make a curry. Will get some more later today and post a pic showing the paste exactly how it is before re-heating.
Rob
The tikka s first cooked in the tandoor as large fillets, and chunks are sliced off as needed. Just like as shown in CBM vol 1. This also reduces the chances of it drying out.