Cut bok choy lengthwise in halves and make sure the core stays intact.
Heat a wok or large skillet with one tablespoon oil. Working in batches, add bok choy cut-side down and cook for 3 minutes until lightly browned without moving. Set aside.
Add one tablespoon of oil along with the minced garlic and ginger to the wok, sauté for one minute.
Mix soy sauce, water, rice vinegar, sesame oil, brown sugar, cornstarch, and black pepper in a small bowl and add it to the skillet. Cook for half a minute until slightly thickened, then add bok choy cut-side up and cook for another 2-3 minutes, tossing occasionally, until fork-tender.
Transfer to a plate and sprinkle with toasted sesame seeds (optional). Serve immediately!
Notes
Bak Choy: I love to use baby bok choy for this recipe. Available in any Asia Shop or in major grocery stores. Regular bok choy works too! 😉 12 ounces (350g) are approx. 6 baby bok choy or 3-4 regular bok choy.
Leftovers can be stored for up to 3 days in an airtight container in the refrigerator.