Ah so in that case the garlic shown on top of the tikka masala must be added when cooking that dish. I've never seen this on a tikka masala personally, which makes me think that a fried garlic tarka might be a signature flavour of this particular BIR's chef. As such I doubt the addition of fried garlic to the base is as ubiquitous as some maybe are assuming, it's just the way this chef (and no doubt some others) does it, but it's not going to be a pre-requisite for cooking BIR base gravy. More likely this base sauce hangs together well just because the onions and spices are cooked correctly. 3 hours of cooking will tend to make sure all the flavours are fully developed, non?