This was recently posted to a 52 Hotline question. I am completely chemistry-challenged so i have no idea if this holds any truth. Have you heard of this? Thx!
added 6 days ago .
It should work fine, but beware of one thing. If you're using good Extra Virgin Olive Oil in a blender, it can take that oil and turn it bitter. That's because droplets of Olive Oil are composed of tightly bound fragments. Using a blender or hand blender or a food processor can break those droplets apart, spilling out bitter compounds into your sauce. The way to avoid this is to start the pesto with a small amount of neutral oil, such as canola. Then once the initial blend is made, transfer to a bowl and hand whisk in the Olive Oil. This also helps you get to the consistency you want."