Grilled Bavette with Chimichurri

Ingredients

• 1/2 cup chopped fresh parsley
• 1/2 cup chopped fresh cilantro
• 1/2 cup chopped red onion
• 1/4 cup olive oil
• 2 tablespoons chopped garlic
• 1/4 cup red wine vinegar
• 1 teaspoon dried oregano
• 1 teaspoon kosher salt
• 1 teaspoon ground black pepper
• 1/2 teaspoon red chili pepper flakes (optional)
• 1 pound bavette steak ((flank steak))
• duck fat spray (or olive oil)
• salt
• pepper