Drain and rinse your cashews after soaking/simmering. Transfer them to your blender/food processor together with the plant based milk, nutritional yeast, apple cider vinegar, garlic, lemon juice, salt and tahini. Stop to scrape down the sides if necessary.
If you are having trouble blending, or want a runnier consistency, add more plant based milk.
If not using a high-speed blender, soak the cashews in warm water for at least 4 hours. Otherwise, either soak for 1 hour or simmer in a saucepan or 15 minutes.