Prepare the tofu: Slice the tofu into small 2cm cubes.
Cook the noodles: Prepare according to the packet instructions.
Prepare the veg: Finely slice the scallions and coriander stalks. Remove the pak choi from its base, roughly chop the white stalks, and keep the green leaves large.
Make the sticky sauce: Mix together garlic, ginger, and the rest of the sticky sauce ingredients until smooth.
Sear the tofu: Heat 15ml (1 tbsp) sesame oil in a frying pan over high heat. Add the cubed tofu and fry for 5 minutes, stirring occasionally, until golden on all sides.
Glaze the tofu: Add half of the sticky sauce, reduce to medium heat, and cook for 2 minutes while stirring constantly. Remove the tofu and set aside.
Make the broth: In the same pan over high heat, add the vegetable stock, coconut milk, remaining sticky sauce, and lime juice. Scrape any stuck bits into the broth, bring to a gentle boil, then reduce to a simmer.
Assemble the bowls: Divide noodles into serving bowls. Ladle over the hot broth with vegetables. Top with sticky tofu.
Garnish & serve: Add lime wedges, chopped coriander, sliced chilli, and chilli oil to taste.