I had a whole container of fresh baby arugula leftover from a picnic a long time ago. Arugula is my favorite salad leaf. It has the same texture as baby spinach, with a nice mild bitter flavor that isn't unpleasing like dandelion leaves. The leaves weren't wilted but they were definitely not the freshest, so I thought perhaps I could make pesto, because pesto tends to use up a lot of leaves for a small volume. Pesto is typically made with basil, but I didn't have any at the time. The result is something that looks like pesto but tastes entirely novel, like nothing you've ever tasted before. It was pretty good.
a ton of old arugula
some parmesean I found in the dairy drawer
a drop of sesame oil
a bit of green onion
one clove of garlic
salt and pepper (i also added white pepper. that stuff is awesome)
I like to fry the garlic and green onion to bring out the flavor before adding it to anything. All you have to do is blend everything together, and PRESTO, you have pesto!