Horseradish sauce is basically ground horseradish in mayo right? I found a non soy vegan mayo recipe, don't know how it tastes:
http://www.pennilessparenting.com/2012/ ... -free.htmlDo any other vegan milks curdle in lemon juice I wonder? Cashew milk maybe? I have no idea. If they do, then its possible that the oil n curdled whatever blender whipped mayo would work...