01 -
Whisk together soy sauce, sugar, mirin, garlic, and ginger in a mixing bowl. Toss the chicken in, making sure it's fully coated, and chill it in the fridge for at least 20 minutes, up to an hour.
02 -
Cook the udon noodles following the instructions on their package. Once done, drain them well and set them aside.
03 -
Cut the green onions and separate the greens from the whites. Rinse the bok choy leaves and slice the mushrooms thinly.
04 -
Pat the marinated chicken dry but save a small amount of marinade (about 1/4 cup). Using 2 tablespoons of oil, brown the chicken on medium-high heat for 4 to 5 minutes per side. Take it out and shred into strips.
05 -
Sauté the white part of the green onions in the remaining oil. Add the reserved marinade and let it thicken a bit. Slowly pour in chicken broth and bring everything to a rolling boil.
06 -
Toss the chicken shreds, mushrooms, and bok choy leaves into the bubbling broth. Cover the pot and let it simmer for around 3 to 5 minutes so the veggies soften up.
07 -
Mix the noodles into the soup. Ladle it into bowls, sprinkle the chopped green onion tops, and enjoy it piping hot.