Soak cashews in hot water for 30 minutes. If you have a high-speed blender, like a Vitamix, soaking is optional. But, it will make the mayo that much creamier.
Add cashews along with all other ingredients to blender and process until smooth and creamy.
Stop and taste test: adding more apple cider vinegar for tanginess; lemon juice for acidity; salt for saltiness; and more water if you want it not so thick.
Blend once more after making final adjustments. Pour into a jar or container and store in fridge until ready to use. It will keep for several days.
