I don't, just don't use shop bought jars of curry sauce. Even pastes I only use in emergencies, although I know many think that they are an acceptable shortcut.
These caught my eye at Ocado - a range of "Holy Cow" sauces with reasonable reviews and half price at 84p.
Anyone tried them? (I tried posting a link, but it just goes to the Ocado half price page).
For the sake of 84p, I might get one to try when REALLY short of time.