Add all ingredients to a high speed blender (such as a vitamix), and blend until smooth.
If necessary while blending, tamp (or stir) and add more water if the dressing is too thick.
Notes
Water: The exact amount of water will depend on how long you soak the nuts for. The nuts will take on the water content as they soak, so you may need more or less additional water depending on how much water they absorb during the process. Gradually add water as required until you reach your desired consistency. Almonds: If you use almonds instead of cashews, remove the almond skin after soaking. It will pop right off.Lower fat: For a lower fat or nut free version, sub white beans or tofu.