Steam Bok choy for 5-6 mins.

Combine the oyster sauce, sugar and water in a bowl. Stir. Set aside.

Combine oil and garlic at the same time in a pan. Turn the heat to on. Cook the garlic in medium heat until it starts to turn light brown.

Pour the oyster sauce mixture in the pan and sprinkle some ground black pepper. Let boil. Let liquid reduced a little.

Pour over to steamed bok choy, drizzle with sesame oil.