Tap Malto (which has been stated above is a modified food starch) is definitely the surest way to go, since foie gras consists mostly of fat. Thing is that foie is relatively subtle in flavour compared to many of the other oils that are usually powderized (truffle, olive, brown butter) and it requires quite a lot of tap malto to get it to a fine powder so you should check to see if it's giving you the flavour. Also tap malto lightens the colour of the food so if you want it to be darker you may need to find a different way.
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