In a large bowl, mix together the sliced skirt steak, La Lechonera Mojo Dry Rub, and olive oil. Let it marinate for at least 30 minutes.
Heat a large skillet or wok over high heat.
Add the marinated steak to the skillet and stir-fry for 2-3 minutes, or until it’s browned on all sides. Remove from skillet and set aside.
In the same skillet, add the sliced bell peppers and onion. Season with salt and black pepper and stir-fry for 2-3 minutes, or until they’re slightly charred and tender.
Add the cooked steak back to the skillet with the peppers and onion. Toss everything together to combine.
Warm the tortillas in a separate skillet or in the microwave.
To assemble the fajitas, spoon the steak and pepper mixture onto a warm tortilla. Add your desired toppings, and roll up the tortilla.