Wash the oysters with water and pat dry using paper towels. Coat them evenly with cornstarch.

Cut the bok choy into bite-sized pieces, separating the stems and leaves. Slice the green onion diagonally.

Mince the ginger and garlic.

Heat sesame oil in a frying pan and add the minced ginger and garlic.

Add the oysters to the pan and stir-fry over medium heat until browned and cooked through. Remove and set aside.

In the same pan, add the bok choy stems and stir-fry over medium heat until coated with oil.

Add the bok choy leaves and green onion to the pan and stir-fry until wilted. Return the oysters to the pan.