Flap steak is basically a sirloin tip. Flank steak or skirt steak is very similar and can be used as substitutions in this recipe.
- In a bowl or a gallon plastic baggie, combine the first seven ingredients. Mix until combined. Add meat to the marinade. Refrigerate at least one hour, preferably overnight.
- Heat a grill or a grilling pan on medium-high heat. Season each side of the beef with fine sea salt. Cook on both sides until desired doneness. Let rest for 5-7 minutes.
- Thinly slice the meat against the grain and serve. Sprinkle with chopped parsley for optional garnish.