hi kendo
what is ment by a curry base is that a sauce is made by a restaurant/takeaway so that it may use this in order to make every curry on the menu. it is also known as onion gravy by those in the trade, as curry base, as curry sauce and as a base sauce. they all mean the same there are many here to choose from and many recipes to try with them all trying to replicate british indian restaurant curries. you my friend have just struck gold and i sure you will not be disappointed. what is the dish you would most like to make? my favourite is chicken vindaloo a dish i eat most nights a week ;D

welcome to cr0 and enjoy your stay. anything you aren't sure about just ask