Sorry I should have made that more clear. Yes I used 1TBLs salkim tomato paste to 4TBLs water. I was trying to find out what was causing the bitter taste.
At first I thought it was the paste(not puree), causing bitternes.
Now I think it's from undercooked spices. A spot of raw mix powder on the tongue, catches the palate & tells me it's the mix powder causing it. It's still there in the badly cooked curries.
Az's tom paste in the vindaloo video, looks much thicker than 1:4. The pan in that vid looks also much 'wetter' regarding the oil, than mine, which is 26cm ali & can suffer from a few dry spots? A slightly smaller pan would definately be easier to do this.
I would suggest for testing purposes to use a fair amount of oil, more than you'd be comfortable with & try both hot singe & long fry...thats where I'm going next
Regards
ELW