In a bowl, combine the egg yolk, onion, 2 tablespoons mushroom sauce, salt and remaining pepper. Crumble beef over mixture and mix well. Shape into two loaves. Separate crescent dough into two rectangles on a baking sheet. Seal perforations. Place meat loaf on each rectangle. Bring edges together and pinch to seal. Bake at 350° for 24-28 minutes or until a meat thermometer inserted into meat loaf reads 160°.
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