Finally take another pan,add a chef's spoon of oil and add a very finely chopped garlic clove and brown it.Tip this into the gravy(rinse the garlic pan out with a spoon of gravy).This seemed to give the gravy a fantastic smokey like flavour.Simmer the sauce for about half an hour and the oil should begin to rise.
JB, is the base gravy blended after the addition of the garlic, or does the garlic just stay there in small pieces which show up in the customer's final dish? If the latter, I guess it's pot luck how much garlic makes its way into each dish cooked, depending how much gravy is left in the pot when you order.
Finally, in the photo you posted (duplicated below), is the sliced garlic floating on top of the tikka masala added during the making of that dish, or has it come from the base gravy? Is it definately finely chopped garlic, not finely sliced garlic which is added to the base?
One last thing:
3 kilo white onions(any sort,they chop them so it cooks quicker and it doesn't affect the taste)
They slice them so they cook quicker, then they cook them for a total of 3hrs?? Can you ask next time you're there how much longer they think it would take to cook the base if the onions were left whole?