Combine the steak marinade, olive oil, lime juice, garlic, red onion, and jalapenos. Pour the marinade over the steak and marinade at least 30 minutes (the longer the better).
When ready to cook, heat a skillet, griddle or grill to high heat (approximately 400 degrees).
Sprinkle the fajita seasoning on the top (least fatty side) of the steak. Place the steak fatty side down and cook for approximately 6 minutes. Flip and cook an additional 5-6 minutes.**
Notes
Notes:We use a fajita seasoning blend for this recipe, if you prefer, you can use taco seasoning. The Fajita seasoning blend we recommend is listed below. You will need 2 tablespoons of this blend for the marinated flank steak.