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Katsudon (カツ丼) is a popular Japanese food, a bowl of rice topped with a deep-fried pork cutlet, egg, and condiments. Variations include sauce katsudon (with Worcestershire sauce), demi katsudon (with demi-glace and often green peas, a specialty of Okayama), shio-katsudon (with salt, another Okayama variety), shōyu-dare katsudon (with soy sauce, Niigata style), and miso-katsudon (a favorite in Nagoya). Beef (gyū-katsu) and chicken (oyakodon) can substitute for the pork.
It has become a modern ritual tradition for Japanese students to eat katsudon the night before taking a major test or school entrance exam. This is because "katsu" is a homophone of the verb 勝つ katsu, meaning "to win" or "to be victorious".
See also 
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