Place a portion of the rice into your grinder and grind for about 15 seconds, or until it reaches a fine, flour-like texture. If your grinder can't hold the full 2 cups of rice, no worries—just grind a little at a time until you're done.
If you want a super smooth flour, go ahead and sift it to catch any tiny bits that didn’t get fully ground.
Once you’re done, store the flour in an airtight container in a cool, dry spot. It’ll stay fresh for up to 5 months—maybe even longer!