Good gravy starts with a roux, a mixture of equal parts fat and flour that’s used to thicken a liquid like broth or milk into a thick, silky sauce. Wheat flour is most commonly used, but you can make a great, gluten-free gravy with sweet rice flour.
from Lifehacker http://skillet.lifehacker.com/make-a-tasty-silky-gluten-free-gravy-with-rice-flour-1788668778
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