1/3 cup mirin
1/4 cup low-sodium soy sauce
1 tablespoon rice wine vinegar
1 tablespoon sesame seeds
4 heads baby bok choy
One 2-inch piece fresh ginger, finely grated
8 ounces peeled and deveined medium shrimp, tails removed
1 slender leek, white part only, thinly sliced on a bias and soaked in cold water to remove grit
1 slender leek, white part only, thinly sliced on a bias and soaked in cold water to remove grit
2 radishes, cut into thin sticks
Japanese hot pepper seasoning, such as shichimi togarashi, optional
8 ounces soba noodles (no salt added)
One 4- to 6-inch piece kombu, rinsed well
1 ounce bonito flakes (also known as katsuobushi)