Hi Moezus,
Quote from: moezus on March 05, 2011, 12:16 PM
I've seen a few recipes that call for frying powdered spices in oil before adding the rest of the ingredients.......what purpose does it serve?
The "essential oils" in the spices are insoluble in aqueous media (e.g. water) but soluble in non-aqueous media (e.g. oil). Frying them in oil releases, and dissolves, their essential oils
QuoteAt what heat?
Good question, there doesn't seem to be much information available on this. I presume some essential oils require more heat to "release" them than others. And that the higher the temperature, the quicker it happens.
Quotefor how long?
Ditto the above. The higher the heat the quicker it happens. In practice, I'd reckon on several tens of seconds (to a couple of minutes for whole spices) at around 160C. But that's a guesstimate.
Quotehow do you know when they are fried adequately?
Yet another good question! Generally, cook them in oil until the oil starts to separate again.
Quotewould it be obvious if they get burnt?
Not really (until you eat the final curry and it tastes bitter! (Though a "bitter" too late, I reckon

!)
My advice would be to rather undercook them (time and temperature) them than risk burning them. You can also make a slurry of them, in water, and add this to the heated oil. Or add curry base, tomato puree, etc, shortly after adding the powdered spices.
As Axe says, it's probably best to add the powdered spices "off heat", then return the pan to the heat and immediately add tomato puree/curry base or whatever (to prevent them burning).
An alternative (or additional) method, to prevent them from burning, is to add the spices (as described above) and then immediately add the meat and coat the meat in the spices....then add the tomato puree/curry base/etc) This also applies to cooking garlic (also to avoid burning it).
Hope this helps...sorry for its longwindedness!
