Top-ranked recipe named "Shiitake Bok Choy Soup with Noodles"
Editors' note: The original recipe calls for Chinese wheat noodles, but we also like this soup made with somen (Japanese thin wheat noodles) or soba (Japanese buckwheat noodles).
"Used buckwheat soba noodles and added half a thin sliced onion browned in sesame oil."- TechCommand
Cut bok choy crosswise into 1/4-inch-thick slices. Discard stems from mushrooms and cut caps into thin slices. Cut scallions diagonally into thin slices.
In a 5- to 6-quart kettle bring 6 cups water to a boil with katsuobushi and boil 1 minute. Pour stock through a fine sieve into a large bowl and discard katsuobushi. Return stock to kettle and add bok choy, mushrooms, and noodles. Simmer soup, uncovered, until noodles are tender, 2 to 5 minutes, depending on type of noodle. Season soup with salt and pepper and stir in scallions.