1/4teaspoonfreshly ground black pepper,plus more for grilling
2poundsflank steak or skirt steak,excess fat removed
In a medium bowl, whisk together all of the ingredients except for the steak.
Place the steak in a large baking dish or gallon size ziplock bag and pour the marinade on top. Turn the steak a few times until it's completely coated with the marinade and refrigerate for 2 to 4 hours. Do not marinate for longer than 8 hours because the meat will start to break down and get mushy.
Remove steak from marinade and discard any excess marinade. Pat steak dry with paper towels and drizzle with a touch of olive oil, enough to coat each side. Season lightly with coarse salt and black pepper on both sides.
Preheat grill for direct heat grilling at medium-high heat (400-450°F). Grill steaks with the lid closed for 4-8 minutes per side, depending on the thickness. Skirt steak will be closer to 4 minutes per side and flank steak will be closer to 6-8 minutes per side.