I'm having the folks around for curries next weekend, so I set about making them to freeze (sauces only - will lob the chicken in on the day)
I made four, two were identical dopiazas, apart from the fact that I pre-fried the spice mix on one and just threw it straight into the sauce on the other. The flavours were quite similar, but the textures were very diffrent.
The fried spice curry had that fluffy texture, you know, where the sauce never seems to mix with the oil. The other had that BIR smoothness, like a soup. It seems like the frying process sort of locks the spices into the oil so they can't mix with the base.
I tasted both, and preferred the non-fried one, though both were
fine. Maybe pre-frying is best for dishes which have little or no base, but loads of oil.
One other interesting point, both curries tasted completely different, after thay had been left to settle - the flavours come out a lot more.l
BTW, I also found that fennel seeds give rice a nice aniseedy overtone.