Even if it tastes the same there is nothing appetizing about brown oxidized pesto. I used to find it so annoying when I would go to all the trouble and time to make a fresh batch of pesto and within minutes it would go from bright green to muddy brown. Bleh. But now thanks to Maria Rodale’s cookbook, Scratch, I finally learned the trick to keep pesto bright green: blanch the basil leaves. So simple! Below is my version of her recipe — it doesn’t have cheese (not that I’m opposed, I just like it better sprinkled on top not mixed in), uses walnuts instead of pine nuts, and less olive oil. The amount below will make enough pesto for a full pound of pasta.
During the harvest season I make as much pesto as possible and freeze in small 4oz. little jars. I used to freeze batches of pesto an ice cube tray, but I found that unless I wrapped each little cube in plastic wrap, they would freezer burn way too quickly. So now I just put in a little jar with a layer of parchment paper cut to size over the pesto and freeze.