Preparation
Preheat a barbecue grill on a high temperature. In a blender, purée the jalapeños, vinegar, bay leaves, and garlic, until smooth. Transfer the paste to a bowl; add the cilantro, oregano, parsley, olive oil, salt, and pepper, to it. Mix it up and keep it aside. Now, season the flank steak with salt, olive oil, and pepper. Grill it for 2 to 3 minutes or longer if you prefer well-done meat. Slice it up and serve with the parsley sauce.