Can I freeze this stew?

Yes. Cool completely, transfer to airtight containers or freezer bags, and freeze for up to 3 months. Thaw overnight in the fridge and reheat gently on the stovetop; you may need to add a splash of water or broth to loosen the thickened broth.

Can I use different greens or beans?

Yes—Swiss chard, spinach, or collards can substitute for kale (adjust cooking time: spinach wilts quickly). Other white beans, like great northern or navy beans, work in place of cannellini.