best chimichurri recipe

Ingredients: 1 cup fresh parsley, finely chopped 1/2 cup fresh cilantro, finely chopped (optional) 4 cloves garlic, minced 1/3 cup red wine vinegar 1/2 cup extra-virgin olive oil 1 teaspoon dried oregano 1/2 teaspoon red pepper flakes (adjust to taste) Salt and black pepper to taste