Add all ingredients to a blender and blend until smooth. Add water if needed to help blend.
Transfer to a jar and store covered in the fridge for up to a week. Mayo will thicken more in the fridge.
Notes
1) Amount of water needed will differ depending on the type of tofu used. For soft/silken firm tofu I usually don't need to add extra water. For medium firm tofu I add about 3 tbsp water.