INGREDIENTS
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1 (16-ounce) package corkscrew macaroni
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2 tablespoons butter
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2 tablespoons all-purpose flour
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1 teaspoon salt
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1/4 teaspoon ground black pepper
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3 cups milk
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2 cups shredded Swiss cheese, divided
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3 (6-ounce) cans tuna, drained, flaked
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2 tomatoes, cut into 1/4-inch-thick slices