What a clever recipe! We decided not to add any soy milk. We also think we used too much squash and wish we had used it on fettucini. Either way, the pesto was divine. In fact, it so good I didn't eat dessert because I wanted to keep savoring that yummy pesto!!! Not sure what purpose the yeast serves, other than causing a mess if you try to store it. It'd skip that in addition to no soy milk.
Very tasty! I used almond milk, and walnuts rather than pine nuts. Also used an extra couple Tbs of nutritional yeast for extra cheesiness. We'll make this again. Thanks for posting it!!!!!!!