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heat butter in a pot
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add onion and carrot and saute until soft about 7 minutes
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add the garlic and cook 1 minute longer
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add the tomatoes, 4 slivered basil leaves, salt & pepper, sugar, chicken stock and allspice
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bring to a boil and simmer for 25 minutes, covered
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puree with a hand blender and add the cream
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season with salt & pepper and serve