In a small bowl, mix together the miso, sugar, oil and water.
For the salmon:
Preheat oven grill (broiler) and place rack approximately 10cm (4in).
Place salmon, skin side down, on a baking tray. Spread the glaze over the salmon and sprinkle with sesame seeds.
Place under grill (broiler) for approximately 6-10min or until the glaze is starting to brown and the salmon gives a little when touched.
For the greens:
While the salmon is cooking, chop bok choy into quarters lengthways. Wash well. Heat a fry pan over high heat. Add the bok choy, water, garlic and sesame oil and cook for 2-3 min or until the bok choy is wilted.