1. Soak the cashews in water at least 4 hours, or overnight in the refrigerator. Drain the cashews and rinse. Add the cashews and two cups water to a blender. Blend until smooth.
2. Blend in 2 cups more water, your sweetener of choice, vanilla extract, sea salt and cinnamon (optional). If your blender can’t totally break down the cashews, strain the milk through a fine mesh strainer or cheese cloth. Store the milk in a covered container in the refrigerator for up to 4 days—stir before using.