The idea for this came from the Well Trained Mind forums. Thanks Wyndie!

baby bok choy
apple cider vinegar
tamari
garlic
olive oil

Cut the bok choy in half lengthwise. Mix together a marinade of apple cider vinegar, tamari, garlic and olive oil. Pour over bok choy and let sit for at least 30 minutes. Bake in a 350*F oven for 20-30 minutes.