Ive just had a look round and unless Ive missed it I can't see a CTM recipe under the BIR recipes section that uses a base sauce.
I make it occasionally like this,
Heat oil, add tsp of g&g puree & mix in, add a tsp of tom pure & mix in, add a heaped tsp of spice mix and a level tsp of tandoori masala, you can add chili powder here to taste but hardly any if you want it to be BIR style.? Fry the spices for a minute or 2 then add a ladle of gravy\base sauce mix in, add another 2 ladles of gravy stirring in one at a time.? Add your precooked chicken tikka, desert spoon of sugar, and a chunk of creamed coconut about 2"x 1" or more if you like it nutty mix this all in.? After a couple of mins take of the heat and gradually stir in some single cream carefull not to curdle it.? Then add a couple of drops of red food coloring for that radioactive BIR appearance stir in and wack back on the heat for a couple of mins, serve and garnish with some fresh coriander?
This one always goes down a storm when I make it, I will type up a proper recipe with quantities when I get home and post to the recipe group?
