Easy Grilled Flank Steak

Place all ingredients but steak in a blender and blend until garlic and cilantro is finely minced. Place the steak in a non-reactive flat bowl or baking dish OR freezer-sized ziplock bag. Add blended mixture and turn steak to coat thoroughly. Cover dish or close bag and refrigerate overnight or up to 36 hours, turning occasionally. About an hour before grilling, remove steak from refrigerator and bring to room temperature. Prepare a medium-hot fire in a grill OR preheat broiler to high. Cook steak to desired degree of doneness, 3-4 minutes per side for rare. Remove from the heat to a platter and allow it to rest for 10 minutes. Slice thinly across grain on the diagonal. Serve with warm flour tortillas, guacamole, refried beans, grated cheese, sliced jalapeño peppers, etc.