Prepare your grill for direct grilling.  You want your grill as hot as you can get it.

Using a sharp knife, score the skirt steak diagonally in a cross hatch pattern about 1/8" deep against the grain to allow your seasoning to penetrate deeper. This also gives more surface area to get a nice char on the meat.

Season liberally with salt and pepper or whatever seasoning  you want to use.

Grill on a super hot grill for 3 to 4 minutes per side, moving around as necessary if you have hot spots to get a good even char on the meat.

Remove from the grill and let rest for about 5 to 6 minutes under foil.

Slice the skirt steak against the grain approximately 1/4" to 1/2" thick.