Gather all the ingredients. Cook the rice according to rice cooker’s instruction. I have instructions for both using rice cooker, and cooking rice on stovetop.
Mentsuyu (Noodle Soup Base): If you can't find a bottle of Mentsuyu, you can make it from scratch. Here's my homemade Mentsuyu recipe.
Recipe by Namiko Chen of Just One Cookbook. All images and content on this site are copyright protected. Please do not use my images without my permission. If you’d like to share this recipe on your site, please re-write the recipe in your own words and link to this post as the original source. Thank you.