Soak the cashews in 1 cup water. Rinse them when they are done and expanded. Make the mayo by adding the oil and vinegar to the blender (high powered one), and then slowly add the milk while it's blending. If you can't add it slowly to your blender then just put it all in at once. It should come out mayonnaise consistency. Next, add the soaked cashews and chipotle peppers. Start small with the peppers so you can control the spice level. If the mixture is too thick then slowly add a little bit (1/8th of a cup) of unsweetened nut milk at a time until you get desired consistency.