How to Make Classic Mornay Sauce with Gruyère and Parmesan
A rich mornay sauce, a béchamel enhanced with Gruyère and Parmesan, is versatile for eggs, pasta, and various vegetables.
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Instructions
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Melt 3 tablespoons butter in a saucepan over medium-low heat.
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Stir in 1/3 cup flour to form a roux; cook 2 to 3 minutes, stirring, to remove raw flour taste.
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Gradually whisk in 2 1/2 cups warm milk until fully incorporated and lump-free.
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Add a peeled 1/4 onion studded with 2 to 3 cloves and 1 bay leaf to the sauce; simmer 10 minutes, reducing by 20 percent.
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Remove bay leaf, onion, and cloves, then strain the sauce.
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Return strained sauce to the pan. Stir in 2 ounces each of grated Gruyère and Parmesan cheese until melted.
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Remove from heat, stir in 1 tablespoon butter, and adjust consistency with up to 1/2 cup milk if needed.