A Ground beef should be used within two days of purchase. Be sure to check the use by information on the package label before purchase. You can store ground beef safely in your refrigerator at 35 to 40 degrees, for one to two days. If you can't use it within that time, freeze it.
Quick loaf pans. Most quick loaf recipes (banana bread, zucchini bread) are written for 9 x 5 x 2 3/4-inch pans, a traditionally shaped loaf pan that's just slightly larger than a yeast bread loaf pan. Caveat emptor: Using a yeast loaf pan for a quick bread recipe may result in batter overflowing the pan. Likewise, using a quick bread pan for a yeast loaf recipe may result in a loaf that doesn't dome. These pans, though similar in size and shape, are not interchangeable. Quick loaves also can be baked in a longer, narrower pan (about 12 x 4 x 2 1/2 inches).
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.