Das Fischbrötchen is a (North) German institution, featuring bread rolls or baguette with fish and raw onions, sometimes also remoulade, lettuce, and pickles. It’s commonly eaten in Northern Germany, due to the region’s proximity to the North Sea and Baltic Sea. The most common preparation is made with Bismarck herring; other varieties include Brathering, Rollmops, sprat, salmon, smoked mackerel, and other varieties of fish. Shrimps are sometimes used as well. Fischbrötchen are commonly served at fast food stands or take-out restaurants.