1 cup of sunflower oil (other oils will work but the taste will vary).
(personally, I use a mix of sesame seed oil and canola oil sometimes)
with 1/2 teaspoon vanilla extract
and a tablespoon maple syrup.
add this second mixture very slowly to the blender mixture in one thin stream, while still blending on high, and keep blending until it gets really thick. (it should get thick as you get to the end of the oil).