Purple kale or curly kale can be substituted for the Tuscan variety (also called lacinato); chop the sturdy leaves instead of tearing them. Spelt is a good alternative to farro, with a similar taste and texture. We prefer French feta, which is typically milder and creamier, to other varieties.
This recipe is one of our Better Basics: 10 New Takes on Family Favorites, see the others.
A no-cook tomato sauce is all about allowing the different ingredients to soak up one another's flavors. Let this one sit for at least an hour -- even three, if you've planned ahead. If your tomatoes are super ripe, skip the knife and tear them to pieces with your hands. (Whole-wheat noodles can sub in for the farro ones.)
Mustard greens have a sharp, radishy bite that's delicious in a bean soup, but, if you like, you can substitute kale or collards. Smaller white beans such as cannellini can be used in place of giant white beans.