If you're looking for a fun April Fools' Day treat, try this traditional Swedish smorgastarta. It's shaped and frosted like a layer cake, but—April Fools'!--it's actually a round, sliceable sandwich with herbed cream cheese, smoked salmon with mustard sauce, fresh shrimp, and herring mousse. It would be a decadent, savory teatime treat for any day of the year. This recipe comes from from Annica Triberg's gorgeous book, Very Swedish, an English translation of Langtans mat.