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Melt butter in a large stockpot. Dice onion and celery and add to pot. Saute until the onion is transparent. Sprinkle flour over onions one tablespoon at a time, stirring in each one thoroughly with a large spoon until paste forms. Add garlic, diced tomatoes and basil, and stir. Stir in tomato puree and beef stock slowly, then whipping cream.  Add bay leaf and simmer on low for about an hour. Remove bay leaf before serving.