What is Yakisoba and yakiudon
Yakisoba (Japanese: 焼きそば [jakiꜜsoba]), “fried noodle”, is a Japanese noodle stir-fry dish. Usually soba means buckwheat, but soba in yakisoba means Chinese noodles (Chuuka soba) made from wheat flour, and are typically flavored with a condiment similar to Worcestershire sauce. The dish first appeared in food stalls in Japan during the post World War II period.
Yakisoba is prepared by frying ramen-style wheat noodles (also called “Chinese noodles” 中華麺) with bite-sized pork and finely chopped vegetables like cabbage, onions, bean sprouts and carrots.
Then flavored with yakisoba sauce, salt and pepper. It can be served with a variety of garnishes, such as aonori (seaweed powder), beni shōga (shredded pickled ginger), katsuobushi (bonito fish flakes) or Japanese-style mayonnaise.
Sometimes udon is used as a replacement for the Chinese-style soba and called yakiudon. This variation originates in Kitakyushu or Kokura in Fukuoka Prefecture.
cited from wikipedia