In a bowl, combine soy sauce, brown sugar, toasted sesame oil, rice vinegar, dark soy sauce, and 1 cup water to make the sauce.
In the large pan or wok, add your soaked and drained noodles and the sauce mixture (soy sauce, oliosaccharide/brown sugar, toasted sesame oil, rice vinegar, dark soy sauce and water).
Cook the noodles over medium heat, stirring occasionally to make sure all the noodles absorb the sauce evenly. Taste to check that the noodles have cooked through, they should be tender but still slightly chewy, and fully transparent but not falling apart.
Use scissors to cut them to about approx 6 inch pieces for easier handling (and eating)
Once the noodles have fully cooked through, turn off the heat, then the prepared ingredients (carrots, mushrooms, spinach, bell pepper and tofu) and mix well to combine.