Yield: 4 - 6 servings
Preheat grill or grill-pan to med-high heat and lightly oil surface. In a large bowl, combine skirt steak, seasoning packet and light brown sugar. Use hands to coat the steak thoroughly with the seasoning and sugar mixture. Grill steak for 4-6 minutes per side, depending on thickness and preferred doneness. Remove from grill, sprinkle with salt to taste, and let meat rest for at least 5 minutes before slicing and serving.
Serve with warm tortillas, raw onion, cilantro, and lime wedges.
If you have the time, let the steak marinate for 15-30 minutes before grilling.