Put the cashews in a bowl and add cold water to cover them. Cover the bowl and refrigerate overnight.
Drain the cashews and rinse under cold water. Place in a blender with enough fresh cold water to cover them by 1 inch. Blend on high for several minutes until very smooth. (If you're not using a professional high-speed blender such as a Vita-Mix, which creates an ultra-smooth cream, strain the cashew cream through a fine-mesh sieve.)