Soak cashew for at least 2 hrs if you don't have a high speed blender.
Add 3 cups of frozen fruits (berries, strawberries, cherries) to a blender and let thaw 2 hrs.
Blend all the ingredients until perfectly creamy. Pour into Mason jars.
Video
Notes
I'm not sure about the exact shelf life of this recipe in the fridge since I've always finished it before it could spoil. I'd estimate it's good for around 4 days, but feel free to let me know your experience when you give it a try!