INGREDIENTS
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6 celery ribs, chopped
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1 large onion or 3 shallots, chopped
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1/4 cup butter, cubed (optional)
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3 cans (14-1/2 ounces each) diced tomatoes, undrained
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1 tablespoon tomato paste
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3/4 cup loosely packed basil leaves, coarsely chopped
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1-1/2 cups whole milk/heavy cream
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3/4 tablespoon brown sugar
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salt and pepper to taste