ty CH for describing me as the Taz expert - no pressure lol. I can confirm that over many years of using this base I've never blended it and returned it to the pan. I make sure the veg is thoroughly cooked, let it cool a little, then blend immediately. I've used both a stick blender and a liquidiser to good effect. The base has so much oil it will keep for at least a week in the fridge. You can freeze in portion sized batches too and I've done this many times also.
As an aside I've just finished making six portions of Punjabi Masala (3 pans going at a time x 2 batches) as I have band mates coming over on Saturday for curry and beer. Tomorrow it will be CTM X 6 and then on Saturday Lamb Kofta curry x 6. There will be plenty left over!
As fried says you need to follow the cooking method as the Taz base and method go together.
Hope this helps, any problems give me a shout.