Halve or quarter the bok choy. Place them cut side up onto a sheet pan.
In a mixing bowl, combine the ingredients of the sauce. Drizzle the sauce onto the bok choy. Try to get the sauce to get into all the crevices of the bok choy. Top with a little kosher salt and fresh ground pepper.
Roast the bok choy for 12-15 minutes or until tender and slightly caramelized.
Remove from the oven and garnish with sesame seeds and green onion slivers.