1 lb flank steak, trimmed |
1/4 teaspoon salt |
1/4 teaspoon black pepper |
1 cup cubed peeled cucumber |
1/2 cup grape tomatoes, halved |
1/4 cup thinly sliced shallot |
1 tablespoon chopped fresh mint |
1 tablespoon chopped fresh basil |
1 tablespoon chopped fresh cilantro |
3 tablespoons light soy sauce |
2 tablespoons fresh lime juice |
2 tablespoons brown sugar |
1/2 teaspoon crushed red pepper flakes |
6 (10 inch) flour tortillas |
12 leaves bibb lettuce |