Place cashews in a spice grinder. I prefer using my spice grinder (this is the one I have) to grind nuts. You can also use a food processor or any other blender you have.Grind to a smooth powder. However don't over grind it else cashews will release oil, you don't want cashew butter! :)You can sieve if there are coarse pieces of cashew. The spice grinder does a really fine job, so I did not sieve the mixture. Set it aside.