After marinating skirt steak in the refrigerator over night, remove & let come to room temp. Heat olive oil in a large cast iron skillet over high heat.
When the olive oil is hot and sizzling sear the steak for about 1 minute on each side or until the internal temperature reaches 140ºF (for medium/rare).
Remove the steak from the pan and let the meat rest for 10 minutes before slicing. Repeat this step with the remaining piece of steak.
Slice the steak and serve with your favorite sides. If you are using the steak in tacos, chop the steak into small, minced pieces.