
½ cup olive oil
1 teaspoon grated lime zest
¼ cup lime juice
3 cloves garlic, minced
1 teaspoon salt
1½ teaspoon ground cumin
1 teaspoon dried oregano leaves
½ teaspoon crushed red pepper
1 pound flank steak
2 tablespoons vegetable oil, divided
1 red bell pepper, seeded and cut into strips
1 yellow bell pepper, seeded and cut into strips
1 medium sweet onion, halved and cut into strips
8 large butterhead lettuce leaves
Desired toppings such as guacamole, salsa and Greek yogurt