Thanks for all your replies. Very big help to me.
I will try cooking the base with the onions whole next time, sounds like a good idea and will save me from having to chop them all up
. I might also try reducing the amount of onion and adding a green pepper and a couple of carrots in there instead. And the sieve idea sounds good as well. 
I have tried to look for Kris's new book from downloading it, but cant find the torrent anywhere, and there aren't many book shops in Thailand for me to buy it. Is her new base anywhere on this forum?
I will try cooking the base with the onions whole next time, sounds like a good idea and will save me from having to chop them all up
. I might also try reducing the amount of onion and adding a green pepper and a couple of carrots in there instead. And the sieve idea sounds good as well. 
I have tried to look for Kris's new book from downloading it, but cant find the torrent anywhere, and there aren't many book shops in Thailand for me to buy it. Is her new base anywhere on this forum?
and would like to make it easier for me. So, my question is can I simply triple the quantities like the following and cook it all in one big pot? And, would I have to adjust the cooking times? Also, for the main dish recipes like the chicken tikka masala can I double or triple the ingredients to make larger batches in one go?