Poach the chicken in salted water, brought to a low simmer. This should take around 10 minutes. Cook to an internal temp of 165°F or 74°C.
Let the chicken rest and cool before slicing into thin pieces.
Meanwhile, cook the frozen edamame according to packet instructions in your microwave or over the hob. Rinse in cold water to cool.
Cook your noodles according to packet instructions, then also rinse in cold water.
Whilst the noodles are cooking, add the sesame oil, soy sauce, fish sauce, brown sugar, rice vinegar and a crack of black pepper to a large mixing bowl. Whisk to combine, then add the cooled noodles straight into the bowl.
Combine with tongs immediately to prevent any sticking. Next, add the spring onion, cucumber, chicken, edamame beans, carrots and coriander. Stir to combine until everything is thoroughly mixed.