Store any leftover soup in an airtight container in the refrigerator for up to 3 days. For longer storage, you can freeze the soup for up to 3 months. Make sure the soup is completely cooled before sealing and storing, and leave a little space in the container to allow for expansion if freezing.
This recipe is very flexible and works beautifully with a variety of vegetables. You can swap or add in fresh or frozen green beans, baby spinach, shredded cabbage, diced butternut squash, sweet potatoes, yellow squash, or peas. If you're using spinach, add it at the very end of the cooking process so it wilts gently without overcooking. Frozen peas can go into the pot at the same time as the pasta and beans, since they only need a few minutes to heat through.
If you want to change up the base, feel free to use whole grains like brown rice, pearl barley, or farro instead of pasta. Keep in mind that brown rice takes longer to cook, so you should add it earlier—along with the broth, tomatoes, and zucchini—so it has time to soften. For barley or farro, it’s best to cook them separately in their own pot of water and then stir them into the finished soup. This prevents the grains from soaking up too much liquid and keeps the broth nice and balanced.