INGREDIENTS
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1 cup cream, half-and-half, milk or a combination, gently heated just until warm
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3 eggs, at room temperature
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3/4 cup grated Emmenthal, Gruyère, Cantal or a combination
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1/4 cup grated Parmesan or hard pecorino
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1/2 teaspoon salt
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1/4 teaspoon cayenne, or to taste
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Butter as needed