Usually, soba noodles are made from buckwheat flour, but soba in yakisoba are Chinese-style noodles (chuuka soba) made from wheat flour, typically flavored with a condiment similar to Worcestershire sauce.
[1] Yakisoba is prepared by frying ramen-style wheat noodles with bite-sized pork and finely chopped vegetables like cabbage, onions, bean sprouts, and carrots.
[2] It is then flavored with Japanese-style Worcestershire sauce, salt, and pepper.
[2] 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.
In Japan, noodles piled into a bun sliced down the middle and garnished with mayonnaise and shreds of red pickled ginger are called yakisoba-pan (pan meaning "bread") and are commonly available at convenience stores[3] and school canteens.