Ingredients

1/4 cup chopped fresh flat-leaf parsley
2 tablespoons red wine vinegar
2 tablespoons extra-virgin olive oil
2 tablespoons beef broth or water
2 tablespoons finely chopped shallot
1 tablespoon chopped fresh oregano
4 cloves garlic, minced (2 teaspoons)
1/2 teaspoon lemon juice
1/4 teaspoon crushed red pepper
Kosher salt to taste
1 1-pound beef flank steak
Freshly ground black pepper, to taste