Sometimes, it’s best left to the professionals. Done right, lefse is moist, chewy and flavorful. Done wrong, it can turn out dry, leathery, tacky or worse. Lefse is a potato-based flat bread of Norwegian heritage and a favorite in many Scandinavian households. But for Marlys Robinson, of Lefse Lane, her lefse always turns out fresh and perfect. Mark your calendars now for her annual Open House on Friday, Dec. 17 from 9-5 and Saturday, Dec 18 from 9-1.