Make the dressing first. To start, soak the cashews overnight. Place them in a bowl, cover them with water, then drain thoroughly once you're ready to get started.
When ready to prepare, place strained cashews in a Vitamix blender or another powerful food processor.
Add water, a little at a time, and keep blending. Continue adding water and blending until the cashews reach a creamy consistency.
Add dill, garlic, lime juice, and salt. Blend well.
Can be made ahead of time. Dressing should last 3-5 days in the refrigerator.