Yield
Makes about 9 cups

How to Make It

Step 1

Sort beans and discard debris. Rinse and drain beans.

Step 2

Finely chop prosciutto.

Step 3

In a 5- to 6-quart pan over high heat, stir carrot, celery, onion, and garlic in oil until onion is limp, about 4 minutes. Add prosciutto and stir just until mixture is lightly browned, 2 to 3 minutes.

Step 4

Add beans, rosemary, 6 cups broth, 2 cups water, and tomatoes; bring to a boil. Cover, reduce heat, and simmer until beans are tender to bite, 2 to 2 1/2 hours; stir occasionally.

Step 5

Purée 1 cup beans in a food processor or blender, then stir into beans. Add broth if beans are too thick. If making ahead, cool, cover, and chill up to 1 day. Reheat, thinning with more broth. Add salt to taste.

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