The red pickled ginger, nori, and bonito flakes are always served with yakisoba. Some people like to add mayonnaise as well. If you can find Japanese mayonnaise, buy it. Japanese mayo is thicker and more suited to be used as a dressing for noodles.
This website provides approximate nutrition information for convenience and as a courtesy only. Nutrition data is gathered primarily from the Spoonacular Database, whenever available, or otherwise other online calculators.