Sauté: Bring a large pot to medium-high heat and add olive oil; swirl to coat the pan. Add pancetta and let cook until fat begins to reduce, approximately 1-2 minutes. Add garlic, onion and leeks and let reduce about 1 minute. Add lemon zest, fresh thyme and swiss chard. Move greens around the pan until they begin to wilt; about 1 minute.
Simmer: Add beans, broth, parmesan rind, lemon juice, white wine and salt. Cover and let simmer 20 minutes or until the parmesan rind has melted quite a bit. Taste and adjust salt and lemon juice, as desired.
Serve: Enjoy immediately with a generous sprinkling of parmesan cheese and grilled bread for dipping.
Notes
Pancetta: for a vegetarian meal you can omit the pancetta, but the flavor won't be as well-rounded because you will be missing that fat element. You can also use bacon, but it has a stronger flavor you only need a little and be sure to drain excess fat that reduces.
Cannellini Beans: option to cook your own beans before hand, please feel free! We wanted this to be a weeknight-friendly recipe. Here is a great article on how to cook dry beans!
Swiss Chard: really up to you how much you want in here - add a couple handfuls and feel free to add more if you want!