One of Sweden’s most delicious exports, Jansson’s temptation, otherwise known as Janssons frestelse, is a creamy potato casserole with melty onions and umami-packed tinned sprats (see Tip) There are a few theories as to the origin of this Swedish classic, which is often served with schnapps as part of the Julbord, or Christmas table One suggests that it was named after a 1928 silent film, while an older story says that it was named after the opera singer Per Adolf Janzon — but that one’s “not so likely” according to Jens Linder, a Swedish food writer

Every president since John Adams has occupied the White House, and the history of this building extends far beyond the construction of its walls. From the Ground Floor Corridor rooms, transformed from...