The night before
Soak the cashews overnight in water. Drain the next morning.
Other Method
If you forgot to soak the cashews, you can boil water and pour of the nuts to soak for 30 minutes. Drain.
Add all of the ingredients into the food processor or high speed blender. Start with 1/2 teaspoon of apple cider vinegar and taste and adjust from there depending on how vinegary you want it to taste.