Start by soaking the cashew nuts for 2 hours. All you need to do is add them into a bowl and cover with water. Drain the soaked nuts and tip them into a blender. Discard the soaking water, add the fresh water and the probiotic capsule into a blender and blitz until you get a smooth texture.
If you are doing this in a high-speed blender, make sure not to overheat the mixture as this will