Steak And Chimichurri Sauce

Ingredients

• 2 cups fresh parsley leaves
• 1-1/2 cups fresh cilantro leaves
• 1/2 medium red onion, coarsely chopped
• 1 to 2 chipotle peppers in adobo sauce
• 5 garlic cloves, sliced
• 1/2 cup olive oil
• 1/4 cup white wine vinegar
• 1 teaspoon grated lime zest
• 1/4 cup lime juice
• 3 teaspoons dried oregano
• 1-1/4 teaspoons salt, divided
• 3/4 teaspoon pepper, divided
• 2 pounds beef flat iron steaks or 2 beef top sirloin steaks (1 pound each)