Heat oven to 350°F. Carefully unroll loaf of dough. Place half of roast beef slices over dough to within 1/2 inch of 1 long side. Sprinkle with fontina cheese; top with remaining roast beef. Starting on long side with filling, roll up. Press seam firmly to seal. Place diagonally, seam side down, on ungreased 15x10-inch pan with sides. In small microwavable bowl, microwave 2 tablespoons of the butter on High 15 to 20 seconds or until melted. Brush over loaf; sprinkle with Parmesan cheese and basil.
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Meanwhile, to make dipping sauce, in 2-quart saucepan, melt remaining 2 tablespoons butter over medium heat. Stir in flour with wire whisk. Cook 2 minutes, stirring constantly. Stir in soup with wire whisk. Bring to a boil over medium-high heat, stirring constantly. Reduce to simmer; cook until thickened, about 10 minutes, stirring occasionally.
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