Soak the cashews in boiling water for about 15 minutes. While they soak, add the rest of the ingredients to a high speed blender. Once cashews have soaked, drain them and add them to the blender. Blend until smooth. Add more plant milk if it's too thick, but just add a tablespoon or 2 at a time so you don't thin it out too much. Taste and adjust for seasoning, that's it!