INGREDIENTS
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2 (2 1/2-pound) lobsters, steamed
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4 tablespoons butter, divided
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1/2 cup dry sherry
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1 shallot, sliced
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1 small fennel bulb, sliced
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1 celery stalk, sliced
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4 garlic cloves, pressed
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2 teaspoons black peppercorns
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2 bay leaves
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4 cups fish stock
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4 cups water
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1/4 cup tomato paste
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2 tablespoons cornstarch
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1/2 cup heavy cream
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Garnish: fresh thyme sprigs