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Spaghetti and somen noodles are both made from wheat flour, but they use different types of flour.
Spaghetti uses durum semolina, which is a coarse flour from a hard variety of wheat. Soumen uses medium-strength flour, which is a finer flour from a softer variety of wheat.
Spaghetti and somen noodles have different production methods. Spaghetti is made by mixing semolina with water, eggs, salt, and olive oil, and then extruding the dough through a machine.
Soumen is made by mixing flour with salt water, kneading the dough, and then stretching it by hand into thin strands.