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Halve the tomato and place, cut side up, in a baking dish.
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Roast at 450 F, for 20 minutes.
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Puree the roasted tomato with the tomato juice, then strain.
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Place in a small saucepan and bring to the boil over a high heat.
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Reduce the heat and simmer for 10 minutes.
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Just before serving, slowly add the butter and warm gently.
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Finally, whisk in the cream.