Heat a large pot over medium heat and add the vegetable oil to heat. Add in the onion, carrot and celery and sweat for 3-4 minutes. Add in the garlic and ginger and cook until fragrant, 2 minutes. Add the chicken broth and chicken breasts and bring to a boil. Reduce to a simmer and cover, cooking until chicken is cooked through.
Remove the chicken from the soup and let cool until able to tear into bite size pieces. Meanwhile add the udon noodles and mushrooms to heat. Add the chicken back into the pot and season with soy sauce and salt and pepper to taste. Once noodles are warmed, sprinkle with cilantro and a lime wedge.
Notes
This soup is sure to cure a cold.
You can find udon noodles in the international section of your grocery store.