Let 2 pounds of pizza dough come to room temperature (this might take up to 2 hours). Roll and stretch into a 5-foot rope, then form into a U shape on a parchment-lined baking sheet, letting the ends hang over the side. Lift the ends and twist them twice, then press the ends down to make a pretzel shape. Brush with beaten egg, sprinkle with coarse salt and bake at 450 degrees F until golden brown, about 30 minutes. Let cool completely, then split in half and fill with pub cheese.