1/4cupwateroptional, to achieve desired consistency
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Place cashews in a cup or small bowl and cover by about 1/2 inch with boiling water. Let soak 30 minutes up to over night.
Drain cashews, reserve the liquid. Place cashews in a blender with vinegar, lemon, salt, and about 1/4 cup of the soaking liquid. Blend until very smooth, adding more soaking liquid as required to puree the mixture.
Recipe and feature image from http://www.wholefoodsmarket.com/recipe/cashew-sour-cream, retrieved Oct. 2012.