Add the dried whitebeans to a large bowl and cover with cold water, 1-2 inches above the beans. Pick through beans and discard any that are damaged or any debris. Soak 4-24 hours, overnight is best. Drain and rinse.
Soup Instructions
Heat the oliveoil in an 8-quart soup pot or stockpot over medium-high heat. Add the onion, celery, bellpepper, 1 teaspoon of the salt, and ¼ teaspoon of the blackpepper and cook, stirring, until the vegetables are tender, about 6 minutes.
Add the minced garlic, dried Italian herbs, and crushedredpepper and cook, stirring, until fragrant, about 1 minute. Add the chickenstock, whitebeans, Parmesanrind, bayleaf, and water and bring to a low boil. Reduce the heat to simmer gently and cook, partially covered and stirring occasionally, until the beans are tender, 45 to 60 minutes.
Using a slotted spoon, transfer about 1 cup of the beans from the pot to a small bowl and mash them with the back of a spoon. Return the mashed beans to the soup and add the remaining 1 tablespoon salt.
Bring to a simmer over medium-high heat and continue to cook, uncovered, until the broth thickens slightly, about 15 minutes. Add the remaining blackpepper, broccolirabe, and rosemarysprig and continue to cook until the broccoli rabe is just tender, about 5 minutes. Stir in the lemonzest and lemonjuice.
Remove the Parmesan rind, bay leaf, and rosemary sprig and discard them.
Serve the soup in wide, shallow bowls, garnished with gratedParmesan and a drizzle of extra-virgin olive oil.
Notes
*Key tip: Mash 1 cup of the cooked beans and stir them back in. This is what gives the broth its creamy body.**Ingredient note: Use a frozen Parmesan rind straight from the freezer. A good dried Italian herb blend (I reach for Spiceology) adds the most flavor when it’s bloomed in the oil with the garlic.***Substitution: Kale or baby spinach can stand in for the broccoli rabe. Vegetable broth makes it vegetarian. See the post for more swaps.****Storage: Keeps up to 4 days in the fridge or 3 months in the freezer. Reheat on the stovetop with a splash of stock, since the beans soak up the broth.