Drizzle each serving with extra-virgin olive oil and/or sprinkle with freshly grated Parmesan and serve with a good crusty bread.
In a soup pot, heat the oil over medium heat, add the pancetta, and saute for about 5 minutes. Remove the meat with a slotted spoon and set aside. Add the onion and saute until golden, about 10 minutes. Add the garlic, rosemary, and pepper flakes; saute for 3 minutes more. Add the escarole, stirring until wilted, about 2 minutes more. Add the beans, tomato, broth, and salt; bring to a boil. Lower the heat to maintain a gentle simmer, cover, and cook for 10 to 15 minutes. Stir in the reserved pancetta and season with salt and pepper. Serve immediately with the oil and/or cheese and the crusty bread.
Swiss chard is a welcome substitute for escarole.
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