Place the cashews into a bowl with cold water, cover and leave to soak (either overnight or 6-8 hours).
When ready to use, drain and add into a food processor.
Add in all other ingredients to the food processor, blend well. You may need to pause and scrape down the sides a couple of times.
If using frozen berries, you can serve straight away, alternatively place into a loaf tin, cover and freeze.
Prior to serving, remove a bit beforehand to soften enough to spoon out with an ice cream scoop. Store any leftovers in the freezer well covered.
