In a mixing bowl add soy sauce, olive oil, freshly minced garlic, crushed red pepper flakes, brown sugar and freshly squeezed lime juice. Whisk the ingredients together until the sugar is dissolved.
Cut the steak into smaller 6 inch pieces and place them in the marinade. Make sure everything is covered and marinade in the fridge for at least an hour.
Preheat the grill to 450 degrees and set for direct heat. Grill the marinated skirt steak 2 minutes per side or until the internal temperature reaches 130 degrees
Remove them from the grill and let them rest for 10 minutes.
Slice with the grain first, rotate 90 degrees and cut across the grain for maximum tenderness.
Notes
Select outside skirt steak over inside. It’s more tender with stronger beef flavors.
Make the marinade the night before and marinate the beef overnight for maximum flavor.
For the ultimate tenderness, grill the skirt steak to a medium rare around 130 degrees Fahrenheit.