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When you get the roe of some kinds of fish, salt and season it, you have an expensive delicacy. It is called caviar. It is commonly used as garnish or as spread. Although it is more commonly associated with Russia, the word caviar is believed to come into the English dictionary by way of France and Italy, thus the term French caviar.
Caviar has its own share of imitations. In Scandinavia, a significantly cheaper version of caviar, made from mashed and smoked cod roe, is sold in tubes as a sandwich filling. A typical Swedish sandwich is hard boiled eggs and cod roe caviar from a tube. Another imitation is Danish or German black colored lump sucker caviar, which is sold throughout Europe in small glass jars. In Finland caviars from the burbot and the common whitefish are also sold.
