If you wanted to make it into Guinness Book of World Records, what would you do? Well, in 1985, a man named Hasse 'Hasse P' Pettersson decided that he would put his slandered hometown Köping on the map again by making the world's longest sandwich cake, or smörgåstårta. The record-winning cake turned out to be 510 meters and 69 centimetres, or 1675 feet and 5 inches. And yes, the record still stands. Sandwich cakes are popular for graduation parties, daytime wedding receptions, and birthday…