I guess community rules won't allow me to post the videos, but you can find the link through my own LJ page.
Here's the very simple recipe for the "cheese sauce":
1/2 cup raw cashews
1/4 cup nutritional yeast
Tbsp. olive oil
*optional, but recommended – 1/2 Tbsp. white miso paste
Add all ingredients to food processor or blender, adding water in small increments until sauce is desired thickness. Salt to taste (you may not need any salt if you add miso paste). Recipe can be easily doubled or tripled for more sauce.
Have a great day! :)