Mix together the ginger, garlic, honey or agave syrup, tamari, sesame oil and chilli powder in a bowl. Add the tofu and turn to coat, then leave for a few minutes to allow the tofu to become infused with the spices.
Remove the tofu from the bowl (keep the marinade). Heat the rapeseed oil in a frying pan, add the tofu and cook until crisp and browned on all sides. Remove the tofu from the pan and set aside.
Add the reserved marinade and water to the pan and bring to the boil. Add the pak choi. Cook for a minute or so, tossing, until the pak choi is covered in the marinade and slightly wilted.
Place the tofu and pak choi on a serving platter and garnish with coriander. Serve with brown rice and lime wedges for squeezing over.