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Sauté the shallots in the butter until soft.
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Add the tomatoes and cook for 2 minutes.
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Add the vermouth and simmer until the sauce is reduced by half.
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Add the cream and cook over medium-high heat until thickened.
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Cut the chilled butter into small pieces. Over low heat, beat the butter into the sauce bit by bit.
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Season with salt, white pepper, and lemon juice. Keep warm.