Gravlaaks is a Swedish specialty of raw salmon that has been cured in a mixture of salt, sugar and dill and is prized around the world. Sliced paper thin, it is served on dark bread as an appetizer, on an open-faced sandwich, or as part of a smorgasbord, often accompanied by a dill-mustard sauce. It can usually be found in gourmet markets or specialty fish markets and should be stored tightly wrapped, in the refrigerator for up to one week.