Soak cashews in water overnight or for 4 hours.

Drain cashews then add to a high speed blender or food processor with rest of ingredients. Blend on high until smooth and silky. Add more vinegar or maple syrup to taste.

Pour into a mixing bowl and chill in refrigerator for 1 hour. Frosting will harden but will soften at room temperature. If you prefer fluffy frosting, whisk or use a hand mixer to fluff up.