Whisk the soy sauce, oil, ginger and cane sugar in a bowl, add the pak choi and mushrooms, mix, transfer to the prepared dish.
Approx. 20 mins. in the centre of an oven preheated to 200°C. Remove, allow to cool slightly.
In a bowl, mix the lime juice with all the other ingredients up to and including the cane sugar. Add the tomatoes, chilli pepper and spring onions along with the pak choi and mushrooms, mix and plate up. Sprinkle the coriander and sesame seeds on top.