I used edamame, which made it really easy and very good! I also used only about 12 oz of pasta. Very light and tasty!
Good recipe for a basic pesto. I used edamame because I could not find fava beans and it seemed like a perfectly good substitution. I also doubled the pesto because I bought too much basil. In the end I added all of the extra pesto and tossed in some extra Parmesan. Not sure if it still qualified as "light" but it was probably much better than the original which seemed a tad under-flavored due to the low ratio of pesto-to-pasta. Served with a simple side salad of baby spinach and lemon garlic vinaigrette.
This turned out to be very good. But the fava beans were a lot of work and not worth all the trouble. I think next time I'll add another type of bean that isn't so time consuming.