Step 1

Combine oyster sauce, soy sauce, wine, and cornstarch in a small bowl and whisk with a fork to combine. Set aside.

Step 2

Heat the oil in a wok over high heat until smoking. Add the liver and stir-fry until the firm but interior is still very pink, 60 to 90 seconds. Remove the liver with a slotted spoon and transfer to a paper towel-lined plate. Set aside.

Step 3

Return wok to high heat. Add the scallions and ginger, and stir-fry until fragrant, about 30 seconds. Add the onions reduce heat to medium, and continue to stir-fry until the onions are soft and slightly caramelized, 5 to 7 minutes.

Step 4

Return liver to wok and add sauce mixture. Stir-fry rapidly to prevent the cornstarch from clumping. Stir-fry the liver until the interior is still pink but no longer rare, about 20 seconds longer. Remove from heat and serve immediately.