Bring a large pot of water to a boil. Add a drizzle of cooking oil.
Working in small batches of 1–5 leaves, dip the lettuce into boiling water for about 2 seconds. Drain well and place on a serving plate.
Heat the remaining oil in a small saucepan over medium heat. Add the garlic and green onion. Sauté for 20–30 seconds, until fragrant and the garlic just begins to turn golden.
Add the soy sauce and oyster sauce. Stir to combine and immediately turn off the heat.
Pour the warm sauce over the lettuce. Gently toss and serve immediately.
Notes
Romaine hearts are the easiest choice. Iceberg also works and stays extra crunchy.Blanch for 2 to 3 seconds. Give very thick ribs a few extra seconds.For a soy-free version, use coconut aminos and a soy-free oyster sauce alternative.