Heat oil in a heavy large pot over medium heat. Add onion, carrots, celery, pancetta, and garlic., Saute until onion is translucent, about 10 min.
Add the swiss chard and potato, saute for 2 minutes
Add tomatoes and rosemary sprig. Simmer until the chard is wilted and tomatoes break down, about 10 min.
Meanwhile, blend 3/4 cup of the bean with 1/4 cup of broth in a processor until almost smooth
Add the pureed bean mixture, remaining broth, and cheese rind to the pot. Simmer until the potato pieces are tender, stirring occasionally (about 15 min.)
Stir in the whole beans and parsley, simmer for 2 minutes
Season with salt and pepper. Remove cheese rind and rosemary sprig
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