Steak and Chimichurri Sandwiches Recipe

Name: Steak and Chimichurri Sandwiches Recipe
Ingredients: For the chimichurri sauce; 1 cup chopped fresh parsley leaves; 1/2 cup chopped fresh cilantro leaves and tender stems; 1 tablespoon chopped fresh oregano leaves; 1 green onion, thinly sliced; 5 medium cloves garlic, minced (about 5 teaspoons); 1 teaspoon lemon zest from 1 lemon; 3/4 cup extra virgin olive oil; 1/4 cup red wine vinegar; 1/2 teaspoon Kosher salt, plus more to taste; For the sandwich; 1 pound skirt steak or flank steak; Freshly ground black pepper, to taste; 2 sandwich or hoagie rolls, each 6 to 7 inches in length