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1/2 cup grated Gruyere cheese
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1/2 cup grated Parmesan cheese
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1 egg, separated
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3 tablespoons milk
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1 tablespoon brandy, optional
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8 slices French bread, 1/2-inch thick, crusts removed
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4 thin slices ham, preferably prosciutto, cut in half
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Sprigs of parsley, or watercress, for garnish
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