1. Preheat a gas grill to medium-high. Lightly score steak; season with salt and pepper.
2. Pulse oil, onion, garlic, capers, parsley, lemon juice, crushed red pepper and anchovy, if desired, in a food processor. Season with salt and pepper.
3. Grill steak 4 to 6 minutes per side for medium-rare. Let stand for 5 minutes.
4. Thinly slice steak against the grain and serve, passing sauce on the side.
This recipe was previously published in All You, Back to School Special, July 2013.