Kamonanban is a Japanese dish prepared with soba noodles in a broth flavored with duck meat, leeks, green onions, and a savory-sweet sauce. There are many variations, so the dish can also be enriched with mushrooms, spinach, and orange zest. Due to the fact that the fatty duck meat is used in kamonanban, the dish is especially popular during the colder days of winter in numerous soba restaurants.