Slideshow: The Food Lab: How To Make The Best Fajitas

Plated
Plated
Ready to serve!
Unfold your steaks
Unfold your steaks

Whole skirt steaks are about two feet long and usually come rolled up from the butcher. You'll want to unroll them on a large cutting board, your sharp boning or chef's knife at the ready.

Bag'em up!
Bag'em up!

After trimming, bag up your steaks with the marinade. sealing the pag until just a small hole is left on one side.

Seal.
Seal.
Seal the bag just as the air finishes getting squeezed out.
Move it around.
Move it around.
Squeeze the bag around to make sure the steak is coated on all surfaces.
Lay it flat.
Lay it flat.
Lay the steaks flat and refrigerate for 3 to 10 hours, flipping occasionally.
Preheat your grill
Preheat your grill
Lay a cast iron skillet on the hot side of a grill set up with a two-zone fire while the grill preheats for about 5 minutes.
Start cooking
Start cooking
Slide the skillet over to the cool side where it will stay hot, then place your marinated skirt steak directly over the coals. Cover.
Flip out!
Flip out!
Cook the steaks, flipping them every minute or so until as they char.
Cook the veggies
Cook the veggies
Slide the cast iron skillet back over to the hot side while the meat rests and add the marinated veggies. Cook the until nicely charred, adding any meat drippings at the end.
Slice against the grain
Slice against the grain
Slice the meat thinly at a 45°F angle to the grain.
Meat!
Meat!
The meat, ready to serve.