Add cashews in a pot of boiling water and allow to cook for about 10 minutes. This will soften them and make them easier to blend. Likewise, you could also just soak them in water for a few hours.
In a high powered blender, combine ALL ingredients listed above except for the dill.
After all ingredients are well combined and creamy, hand mix in the finely chopped Dill (this is so your Ranch Dressing doesn't turn lime green :) )