Mix in the soy sauce and sake, add the chicken and marinate for 20 minutes. To make the negi sauce, mix the leek, chives and ginger in a small bowl, along with the soy sauce, rice vinegar ...

For this recipe, buy dried udon that’s about the thickness of linguine. The Japanese leek (negi) is smaller than the European leek, which is sometimes called a Welsh onion. Japanese negi are ...