Bring 3 cups of water to a boil in a small saucepan. Add soup stock base packet, soy sauce, mirin, sugar, and rice vinegar. Let simmer over medium-high heat for about 5 minutes.
Add bonito flakes, let simmer for another 5 minutes.
Let cool, then chill in refrigerator.
Prepare the soba noodles according to the directions on the packaging.
Strain the noodles in a large colander, then rinse with cold tap water (as cold as possible) for about a minute. Make sure all the noodles are cold.
When the noodles are cold, let it dry for a few minutes, then store in the fridge under plastic wrap until ready to serve.
Garnish with shredded nori and sliced scallions. Serve with the chilled broth.
Enjoy!
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