The noodles are first boiled, then added to the sauteed vegetables and proteins to cook briefly. Yakisoba is typically cooked in an iron pan or on an iron cook top; the pan is usually flat, with plenty of room for the dish to lightly brown. Cooking yakisoba in a too-small pan often results in the dish boiling rather than frying; frying food in a flat iron pan is known as teppanyaki in Japanese.
Once the food is cooked, a sweet sauce is added to the pan and the food is further cooked until the noodles absorb the sauce. Yakisoba sauce, often sold in prepared form in stores, is similar to a thick Worcestershire sauce, with a hint of soy, garlic, and brown sugar. Yakisoba is often served with condiments. In Japan, mayonnaise, pickled ginger, dried fish flakes, and ground seaweed are popular.
Different versions of the fried noodle dish are served in nearly every Japanese restaurant and it is a common family meal in Japanese homes. Street vendors often make the dish during festivals, and it can be found at stands, similar to hot dog stands in the U.S., in large Japanese cities. Vendors often provide a variety of meats and vegetables, and customers can pick what they want in their fried noodle dish.
In Japan, it is common for mobile vendors to drive around residential areas serving one style of food. This Japanese dish is often served in this way. Vendors usually provide different communities with a schedule, and on the night the van will be passing through, residents leave a light on indicating they would like to purchase it. As with street vendors, vans selling yakisoba often provide a variety of options.
Prepackaged, instant yakisoba is also common in convenience stores in Japan, as well as many grocery stores all over the world. Water is added to dehydrated noodles, meat, and vegetables and then cooked. The sauce is then stirred into the dish, and it's ready to eat. Larger convenience stores in Japan often serve fresh fried noodles; this is a popular lunch for Japanese workers.