Pressed Salmon Sushi Tart

Salmon caught in the chilly rivers of Hokkaidō, Japan’s northernmost island, is utterly delicious and the natives there take great pride in their salmon cookery. Box lunches made from local produce and seafood are sold to travelers in many train stations throughout Japan, and the station of Asahigawa, Hokkaidō, is famous for its pressed salmon sushi, called Daisetsu Oshi-Zushi. The name derives from the station’s location at the foot of Mount Daisetsu, which means “Big Snows.”