Drain the water from the pre-soaked cashews. Put the cashews into the blender.
Add the lime juice, apple cider vinegar, salt and water
Blitz the ingredients in the blender until the mixture has a nice smooth creamy texture. This may involve stopping to scrape down the sides a couple of times depending on the type of blender that you have.
Notes
Pre-soak the cashews for around 15 minutes in hot water, or 2 hours in cold water. If you have a high powered blender like a Vitamix, it is not required to pre-soak the cashews, although it does help with the smooth, creamy texture.