Pesto will tolerate anything short of a garnish of autumn leaves. There are strictures—you do need an herb or vegetable, you do need oil—but they are not very strict. Add any nut you want (or none). Add garlic or not. Add cheese or not. Add almost any herb or green, alone or in combination. A pesto recipe is a Rorschach test for how you see the kitchen: you put in the things most prominent in your mind.
Read more: Kale and Other Pestos on FOOD52