Powdered sugar with tapioca starch instead of corn starch is available at Trader Joe's and places like Whole Foods, if this is suitable for Passover. Or, if you have a super-blender like a Vitamix (with the DRY ingredient container) makes powdered sugar out of regular sugar in a jiffy, no starch needed! (The corn/tapioca starch is there to keep it from clumping while it sits on the store shelf) -A corn-allergic shiksa

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