Grilled Flank Steak with Chimichurri Sauce - Great Southern Restaurants

Ingredients

• 1 small onion, coarsely chopped
• 2 teaspoons minced garlic
• 1 cup flat-leaf parsley removed from stem and coarsely chopped
• 1 teaspoon fresh thyme leaves removed from stem
• 1 teaspoon dried oregano leaf
• 1/2 teaspoon red chili flakes
• 1/4 cup apple cider vinegar
• 1/2 cup extra virgin olive oil
• About 3/4 teaspoon kosher salt
• About 3/4 teaspoon freshly ground black pepper
• 2 10- to 16-ounce flank steaks (trimmed)
• 3 tablespoons pure olive oil
• 1 tablespoon Creole mustard
• 1 tablespoon minced garlic
• Pinch kosher salt
• Freshly cracked black pepper