You may need to use a spatula to scrape it down as you go since it’s a bit of a thicker texture. You can also add a splash of water to help keep it moving in the blender. 

All cilantro bunches are going to be different sizes so if you get a small one, I would use two cilantro bunches. You want 1.5 – 2 cups so that there’s enough to give it some body.

A small blender or food processor (like this one) works best for this sauce! If you’re using a larger blender, you will want to double the amounts in order to give it enough volume to actually be able to blend properly.