Step 1

In a small bowl, stir together the tamari, water, rice vinegar, mirin, sesame oil, garlic, and red pepper flakes.

Step 2

Heat the avocado oil in a large skillet over medium-high heat. Add half the bok choy, cut side down, and sear until browned on each side, 1 to 2 minutes per side. Remove, add more oil to the pan, if necessary, and add the remaining bok choy and repeat.

Step 3

Add all of the bok choy back to the pan along with the sauce. Toss, then cover and cook 1 to 2 more minutes, or until the bok choy is tender.

Step 4

Transfer to a platter, sprinkle with sesame seeds, and serve.