INGREDIENTS
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Ingredients3 tablespoons unsalted butter
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1 large shallot, thinly sliced
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3 tablespoons all-purpose flour
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1 cup milk
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2 teaspoon whole-grain mustard
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Pinch of freshly grated nutmeg
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Salt
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Pepper
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1/2 pound all-butter puff pasty, cut in half
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2 ounces Comté cheese, shredded (2/3 cup)
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1/2 pound thinly sliced baked ham
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1 large egg yolk mixed with 1 teaspoon water