Pasta Salad with Arugula

This is from my Mac & Cheese cookbook - Macaroni and Cheese by Marlena Spieler, for my friend Susan, who I told I would post this for, because she has a CSA share and a lot of arugula.  But you should try it too, because it is amazing.  (And amazingly easy - the best kind of amazing.)
Ingredients:
1 large unwaxed lemon
12 ounces orecchiette (I used those piccolini bow-ties the last time and I think shells before that. Any pasta is okay, but I'd go for something flat if possible.)
1/4 cup extra-virgin olive oil
8-10 ounces Bulgarian, Israeli, or Greek feta cheese (I use President from Costco.)
Salt and freshly ground black pepper to taste
2 cups loosely packed arugula leaves (washed)

Process:
1.) Zest the lemon, put in a small bowl.  Squeeze lemon juice into the bowl. Mind the seeds.
2.) Cook the pasta until al dente, drain.
3.) Put pasta in a large bowl (I love a stainless steel mixing bowl for pasta salad since it transfers heat so much better in the fridge.)
4.) Add lemon juice and olive oil to the pasta, set for up to two hours to cool.
5.) Before serving, toss with feta, salt, and pepper.  Serve w/ arugula at room temperature.

This is great for bar review lunches and dinners, btw.  Anything I can eat cold is fantastic.