Whisk the ingredients for the sauce together, taste for balance, and adjust as needed.
Remove and discard any damaged outer leaves from the bok choy. Wash well and drain.
Heat a heavy‑bottomed pan over medium‑high heat. Add the vegetable oil, garlic, and ginger and cook until the garlic just starts to color, then add the Bok Choy.
Cook, stirring and tossing, until just tender, about 4 to 5 minutes. Season lightly with the salt. Serve with a small dish of tamari sauce.