Lay the skirt steak down on a cutting board and pound the skirt steak with a meat tenderizer to make the steak the same thickness, about ½ -1 inch thick. Season the meat with salt and massage the salt into the meat with your hands. Transfer the steak to a plastic bag or a baking dish.

Next, grind black peppercorns in a mortar in a pestle or in a coffee grinder. Be sure the peppercorns are ground into small pieces and not a powder. Transfer the black peppercorns to a bowl. Add the garlic, coriander, brown sugar, Worcestershire sauce, lime juice, and olive oil to the peppercorns and whisk all these ingredients together.

Pour the mixture over the beef and massage the marinade into the beef. Let the beef sit in the marinade overnight.