Right off the bat it seems less than authentic without the pine nuts (or whatever nut you use in your pesto). But what if you love pesto like I love pesto and what if you have all the fresh basil in the world at your disposal like I do (perhaps a mild exaggeration, but the basil from my herb vendor at the market here in France is exceptional and plentiful!)? And what if you are allergic to tree nuts like I am?!
You find a way and you make a nut-free pesto that will rival any traditional version.