1. Cut base off escarole; rinse and drain leaves. Cut leaves crosswise into 1/4-inch-wide strips.
2. Set a 4- to 5-quart pan over medium-high heat. When hot, add oil, onion, garlic, and prosciutto; stir often until onion is limp, 3 to 5 minutes.
3. Add broth and beans, cover, and bring to a boil over high heat. Stir in escarole and cook just until wilted, about 1 minute. Add salt and pepper to taste. Ladle into bowls and offer cheese to add to taste.
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