Mix all of the ingredients together in a spice grinder, a small food processor, or the dry blade of a high-speed blender. Do not over-mix or you'll end up with cheesy walnut butter! It only takes about 10 seconds to grind everything together in my Blendtec high-speed blender.
Store in the refrigerator until ready to use.
If you're allergic to walnuts, you can substitute just about any nut or seed.