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Cured salmon is raw salmon that has been cured (preserved) by some combination of fermentation, pickling, or smoking before it is eaten. Recipes exist from many cultures stretching from the people of early to modern Scandinavia to the Native Americans.
The process of curing fish has been around for a significant amount of time as it has been used as a way to preserve fish from spoiling. The process usually involves an abundance of salt or sugar even sometimes both. A dry rub is mixed together using salt/sugar and an assortment of desired herbs. This is rubbed onto the surface of the salmon, which is then put aside for a number of hours or days. The salt/sugar "cooks" the fish by drawing a large amount of liquid out and replacing it with salt/sugar mixture. At the end of the process the result is cured salmon.