Udon noodle soup is a very popular recipe from the Japanese cuisine. Udon, basically are thick and white wheat flour noodles that are offered as hot noodle soup. Udon soup consists of the udon noodles that are served in dashi, a Japanese broth. The soup tastes best when consumed hot and is usually topped with tempura, chopped scallions, Japanese fish cake or tofu. For extra delicious taste add simchi which is a Japanese spice mix.