Clean the bok choy. Cut off about 1-1 1/2 inches of the thickest part of the stem, the bottom.
Separate the leaves of the bok choy and rinse to clean. For the medium/large bok choy, cut each leaf in half where the stem ends. If using baby bok choy, there is no need to do this.
Heat a cast iron pan to medium-high heat. Add the olive oil.
Add the garlic, scallions and ginger and saute for 2 minutes. Then, add the bok choy leaves and saute for an additional 3 minutes.
Turn the heat down to low, and add the soy sauce and water. Place the lid on, and let the bok choy steam for about 15 minutes.
You are looking for the stems to be completely cooked through, and easily poked with a fork. Enjoy!