Bring a large saucepan of salted water to the boil. Add ½ of the ginger then place salmon in the saucepan, return to the boil, then remove from heat, cover with lid and set aside to poach for 10 minutes.
Cook the noodles accord to the packet directions and divide noodles into four bowls
In a medium saucepan, bring stock the boil, add the ginger and bok choi, simmer for two minutes. Remove bok choi and divide onto noodles, then pour about 1 cup of chicken stock over each bowl.
Remove salmon from the poaching liquid and flake into bite size pieces and arrange over each bowl and sprinkle with crispy fried shallots.