*Luxury ingredient: Fresh mozzarella. It really makes a difference in here. If you like, you can use those tiny fresh mozzarella balls (they are so good), and if they seem too big you can cut them in half, or even in quarters. Don’t make them too small, though, because it’s nice to bite into a chunk of fresh mozzarella in this texturally fun dish. If using a larger hunk of cheese, just cut it into large diced pieces.
**Young, small (and therefore not so bitter) arugula is best for this. Just pinch off and discard any stem extending past the base of the leaf and use the rest. For older, larger arugula, remove and use only the leaves, and discard the stems.
A minimum of 30 minutes is needed for marinating the chickpeas and mozzarella. It’s important for them to become infused with strong flavor. You can also let it marinate longer than this (up to two days would be fine) but for this, it must be refrigerated.
Stir in the chickpeas and mozzarella, and grind in a generous amount of black pepper. Cover the bowl with plastic wrap, foil, or just a plate, and let it stand at room temperature at least 30 minutes.
When you are ready to assemble the dish, Put up a large pot of water to boil over high heat and add a tablespoon of salt. Place a large colander in the sink. When the water boils, add the pasta, keeping the heat high. Cook for the amount of time recommended on the package, checking it toward the end of the suggested time, to be sure it is not getting overcooked. When the pasta is just tender enough to bite into comfortably, dump the water-plus-pasta into the colander. Shake to mostly drain (it’s okay to leave some water clinging), then transfer directly to the chickpea mixture in the bowl.
Toss well from the bottom, sprinkling in the Parmesan, chopped arugula, tomatoes and walnuts as you go. Serve at room temperature or chilled - plain, or garnished with any of the extras listed below.
Source: Courtesy of Mollie Katzen for the California Walnut Board