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Warm oil in a large saucepan. Add onion and cook until
transparent, around 10 minutes.
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Add drained can of beans, water, carrots, and celery.
Bring to boil, cover, and simmer for 1 hour.
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Add potato, tomatoes, tomato paste, salt, and pepper.
Cover and simmer for 30 minutes.
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Add green beans and zucchini and simmer, uncovered, for
15 minutes.
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Add shredded cabbage (or bok choy) and pasta. Simmer
until pasta is tender, around 15 minutes.
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Serve in a bowl with freshly grated parmesan.