Bok choy gets sold as a subtle vegetable, and most home versions treat it that way: quick sautéed, lightly seasoned, forgettable. Treated right, it's the opposite. Halved lengthwise and seared cut-side down over screaming heat, the flat cut face caramelizes into a deeply charred, sweet, almost nutty surface that becomes the whole reason to eat the dish.
Halving matters. Separating the leaves gives you a pile of greens that steam and soften, which is fine but bland. Keeping the bok choy halved with the core intact gives you something architectural: a flat surface for searing and intact ribs that hold their crunch through cooking. The visual is also dramatically better.
The pan needs to be properly hot. A wok or wide skillet over the highest heat possible, oil smoking, no exceptions. Lay the bok choy cut-side down and don't touch for two full minutes. The cut face should come up blackened in spots, caramelized throughout, genuinely charred. If you didn't hit that heat level, you missed the whole point.
Flip and cook one more minute on the rounded side. Less time here because the leaves wilt fast and you don't want them limp. Push everything to the sides of the pan.
The sauce is built in the center. Minced garlic for twenty seconds in the hot center of the pan. Oyster sauce, soy, sesame oil, sugar, water, all premixed beforehand. Pour over everything and toss for thirty seconds until the sauce bubbles and glazes over every surface. The oyster sauce is what gives the signature restaurant-look shine. Toasted sesame seeds, an optional chili oil drizzle. A side dish that eats like a main.