Flank Steak with Parsley-Garlic Sauce

"Based on chimichurri, a staple of Argentinean steakhouses, this zesty sauce can be served with just about any cut of meat. It is also great drizzled over roasted potatoes and other vegetables or stirred into rice or minestrone."

Make 4 servings.

Ingredients :

• 1 1/2 pounds flank steak
• Coarse salt and ground pepper
• 1 tablespoon plus 1/4 cup olive oil
• 1 to 2 cloves garlic
• 1 bunch flat-leaf parsley, stemmed (about 4 cups)
• 3 tablespoons fresh oregano leaves
• 3 tablespoons white-wine vinegar
• 1/8 teaspoon red-pepper flakes

Directions :

1. Generously season both sides of flank steak with salt and pepper. Heat 1 tablespoon oil in a large skillet over medium-high heat. Cook steak 5 to 8 minutes per side for medium-rare. Transfer to a cutting board; let rest, covered, 10 minutes. Thinly slice against the grain.
2. Meanwhile, make sauce: In a food processor, pulse garlic until finely chopped. Add parsley, oregano, vinegar, pepper flakes, 1/4 cup oil, 2 tablespoons water, and 1/2 teaspoon salt. Pulse until herbs are finely chopped. Serve with steak.