Ingredients:

1/4 cup soy sauce
1 tablespoon sugar
2 teaspoons Asian sesame oil
1 bunch scallions (white and pale green parts separated from greens), minced
1 tablespoon minced garlic
1 tablespoon minced peeled fresh ginger
3 tablespoons sesame seeds, toasted
1 pound flank steak, cut across the grain into very thin slices (no more than 1/8 inch thick)
1 tablespoon vegetable oil
Butter lettuce or other soft-leaf lettuce
Thinly sliced garlic
Packaged kimchi*
Steamed white rice

Method:

Stir together soy sauce, sugar, sesame oil, white and pale green scallions, garlic, ginger, and 2 tablespoons sesame seeds in a bowl until sugar is dissolved. Add steak and toss to coat, then marinate 15 minutes.

Heat vegetable oil in a 12-inch heavy skillet over high heat until just smoking, then add steak in 1 layer and saute, turning over occasionally, until browned and just cooked through, about 5 minutes total. Transfer to a platter and sprinkle with scallion greens and remaining 1 tablespoon sesame seeds, then serve with accompaniments.