Cowboy Steak With Chimichurri Sauce

Name: Cowboy Steak With Chimichurri Sauce
Ingredients: 1 1/2 cups firmly packed fresh flat leaf parsley , thick stems removed; 4 to 6 cloves garlic; 3 tablespoons fresh oregano leaves; 3 tablespoons red or white wine vinegar; 3/4 cup extra virgin olive oil; 1 1/2 teaspoons sea salt; 1/2 teaspoon red pepper flakes; 1/4 teaspoon freshly ground black pepper; 1 ( 2 - pound ) cowboy steak , or other 2-inch thick bone-in beef rib steak; Kosher salt , to taste; Freshly ground black pepper , to taste