INGREDIENTS
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1 1/2 teaspoons finely chopped onion
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1 1/2 tablespoons unsalted butter
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2 tablespoons all-purpose flour
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1 1/2 cups milk
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a pinch of cayenne
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1 tablespoon dry Sherry
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3/4 cup grated extra-sharp Cheddar
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4 slices of homemade-type white bread, toasted lightly
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1/2 pound cooked turkey breast, sliced thin
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4 thin slices of tomato
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8 slices of cooked bacon
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1 tablespoon freshly grated Parmesan