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Peel and cut potatoes into 1/2 inch cubes.
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Cut celery into 1/2 inch pieces.
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Core, blanch, peel and cut tomatoes into 1/2 inch chunks.
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Cut marrow into 1/4 inch slices.
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In a large saucepan, heat oil and brown garlic. Discard garlic. Add potatoes, stir to coat and cook for about 5 minutes.
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Add onion, celery, parsley, and oregano, and cook until onions are softened.
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Add stock, tomatoes, marrow, and salt and bring to a boil.
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Reduce heat and simmer until zucchini is tender.
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Pour soup into individual bowls and sprinkle freshly ground pepper and 1 teaspoon Parmesan cheese over each serving.
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Serve hot. Makes 6 servings.