Place the sliced skirt steak in a bowl, add lime juice and 1/2 tbsp Cajun seasoning, set aside
Heat a cast-iron skillet to medium heat with 1 tbsp EVOO, add onions and sauté for 2 minutes
Add the bell peppers, garlic, cumin, the other 1/2 tbsp of Cajun seasoning
Remove from pan, set aside
Heat another tbsp of EVOO to medium-high heat, add steak and brown for 2 minutes
Add the veggies back to the pan with some S&P, and perhaps more lime juice for flavour for 3 minutes
Make sure the meat is just losing it's pink on the inside
Serve immediately in lettuce leaves (double layer works best) and garnishes