INGREDIENTS
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2 tablespoons olive oil, plus more for serving (optional)
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1 medium red onion, chopped
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2 medium carrots, peeled and diced
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1 large celery stalk, diced
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1/4 teaspoon red-pepper flakes
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1 teaspoon minced fresh rosemary, or 1/4 teaspoon dried
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Coarse salt and ground pepper
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1 can (14.5 ounces) whole peeled tomatoes, drained and finely chopped
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1 large potato, peeled and diced
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1/4 head Savoy or green cabbage (1/2 pound), cored and thinly sliced
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1 can (15 ounces) cannellini beans, rinsed and drained
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1/2 pound green beans, trimmed and cut into 1-inch pieces
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1 garlic clove, minced (optional)
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1/4 cup thinly sliced fresh basil, plus torn leaves for serving (optional)
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3/4 cup grated Parmesan, for serving