Manchego cheese crumbles (or any other flavorful hard cheese)
Place the skirt steak and all ingredients for the marinade in a large Ziploc Bag. Shake to coat the meat. Chill for at least 1 hour and up to 4 hours.
Heat 2 tablespoons of avocado oil in a large frying pan over medium high heat. Add the marinated steak and cook for 4 minutes on each side for medium rare, longer if you prefer your steak more well done. If steak begins to burn, turn heat down to medium. When the steak is done, let it rest for 10 minutes.
While steak is resting, scrape off and remove any burned bits on the bottom of the pan. Add another tablespoon of avocado oil if necessary and cook bell peppers and onion over medium high heat for 6-8 minutes, until somewhat softened. Remove from heat and set aside in a warm place.
When the steak is done resting, thinly slice it against the grain for optimum tenderness.
Bring it to the table. Assembling your fajitas at the table is half the fun! Add a few steak slices, peppers, and onions to your tortillas and top with cilantro, avocado, Manchego cheese, and your favorite hot sauce.