There are many different forms of pesto and different ways to prepare it. This one, however, is Giada's version of the classic basil pesto, or pesto alla Genovese! The most basic, most traditional pesto is this basil-based one that was invented in Genoa, in northern Italy; it’s bright green and wonderfully aromatic. Be sure to add your oil slowly, so that the sauce fully emulsifies – that is, all the ingredients bind together, creating a thick, uniform consistency.
