Using a meat tenderizer, pound the skirt steaks until flattened.
Combine the marinade ingredients in a large ziploc bag.
Place the steaks in the bag and let marinate for a minimum of 2 hours, in the fridge.
Remove from the fridge, and let come to room temperature.
BBQ on a hot grill to desired doneness (about 3-4 minutes a side gives a medium rare)