In a large sauce pan or pot, heat vegetable oil on medium high. Stir in the grated ginger, garlic, white part of the onions, and red pepper flakes. Cook and stir for 3 to 5 minutes until the garlic is golden and the ginger is aromatic. (The smell is amazing.)
Add the fresh sliced mushrooms and stir. Pour the chicken broth over the top and stir in the rice wine vinegar.
Bring to a low boil and add the JSL Fortune Udon Noodles. Boil for 2 minutes. Reduce heat to simmer.
Season with soy sauce as desired.
Serve hot and garnish with Sriracha and fresh cilantro as desired.