If the tubes are a struggle Gagomes, try to get a tin of puree.

That's the same as i use, i just get a big tub empty the whole tin into it and add two of the tins of water then add tandoori Powder and mix well.
Keeps in the fridge for weeks.
I must say that if a recipe asks for tomato puree then use tomato puree, i make a Balti recipe which asks for 1 tbsp tomato puree but yesterday didn't have any so used blended tinned tomatoes and the result was not even close to the original recipe that used tomato puree.