Place cashews in a container and cover with filtered water. Allow to soak for 3-6 hours. This softens the nut and makes it easier to blend. Plus you can benefit from the breakdown of phytic acid. Also check out How to Soak and Dry Nuts and Seeds.
Drain nuts and place in a blender. Add enough filtered water to just cover the nuts.
Add maple syrup (or other sweetener) and spices and blend thoroughly.
Store safely in the refrigerator for up to five days.