Preparation
-
Step 1
Combine 1/4 cup finely chopped English hothouse or Persian cucumber, 1/4 cup thinly sliced scallions, 1 1/2 tablespoons fresh lime juice, and 1 teaspoon finely grated peeled ginger in a medium bowl. Season to taste with kosher salt and set aside.
Step 2
Heat a grill pan or a lightly oiled cast-iron skillet over high heat. Season an 8-ounce flank steak with 1/2 teaspoon salt and 1/4 teaspoon chili powder. Grill steak, turning once, until charred on both sides, about 8 minutes for medium-rare. Transfer to a cutting board and let rest for 10 minutes.
Step 3
Arrange 16 small crunchy inner leaves of butter lettuce, romaine, or endive on a large platter. Thinly slice steak against the grain, then cut slices crosswise into 1-inch pieces. Add steak to cucumber mixture and toss to mix. Season to taste with salt and more lime juice, if desired.
Step 4
Divide steak salad among lettuce cups; garnish with 2 tablespoons chopped salted roasted peanuts and 2 tablespoons thinly sliced fresh mint leaves. Drizzle with Asian sweet chili sauce.