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Gravlax is a piece of Swedish food history, except for Swedish Meatballs, I think gravlax is the most famous culinary Swedish dish in the world. You can get gravlax served in many parts of the world in many different restaurants. Most of the time it is prepared the same way, use the same amount of salt and sugar. If you do use more salt then sugar the harder the salmon will get and it is usually recommended that you use the middle piece of a salmon file.