Step 1

Marinate chicken in 1/4 cup teriyaki sauce for 20 minutes.

Step 2

Preheat an oiled grill or grill pan. Grill chicken over medium heat, turning once, for 15 minutes or until cooked through. Transfer to cutting board, and tent with foil; let stand.

Step 3

Combine broth, water, ginger, garlic, and remaining 1 1/2 tablespoon teriyaki sauce in a saucepan; bring to a boil. Add mushrooms, carrots, and scallions; simmer for 10 minutes.

Step 4

Boil soba for 4 minutes or until just tender. Drain and divide among serving bowls. Stir sesame oil, basil, and cilantro into broth; divide among bowls. Slice chicken, and add to bowls along with radishes.