Ingredients

12 ounces well-trimmed flank steak
1 tablespoon minced garlic
1 tablespoon dry sherry
1 1/2 teaspoons cornstarch
1 teaspoon low-sodium soy sauce
1/4 teaspoon freshly ground black pepper
2 tablespoons peanut or vegetable oil, divided
1 large red bell pepper, cut into 1/4-inchwide strips
1/2 cup thinly sliced red onion
1 teaspoon ground chili powder
3/4 teaspoon salt
1/3 cup chopped cilantro
12 small Boston lettuce leaves
Lime wedges