INGREDIENTS
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2 tablespoons unsalted butter plus 1 teaspoon, melted
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1/2 oz Parmigiano-Reggiano, finely grated with a rasp (1/2 cup)
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4 (1/4-inch-thick) center-cut slices from a small tomato
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2 tablespoons all-purpose flour
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1 cup whole milk
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1/8 teaspoon salt
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1/8 teaspoon black pepper
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1/8 teaspoon cayenne
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2 oz coarsely shredded sharp Cheddar (1/2 cup) plus 2 tablespoons for sprinkling
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2 large eggs, separated