Ingredients

  • 2 garlic cloves, sliced
  • 1 tablespoon rosemary leaves
  • 1 tablespoon dried oregano
  • 2 tablespoons whole-grain mustard
  • 1/2 cup balsamic vinegar
  • 1 cup extra-virgin olive oil, plus more for grilling
  • Kosher salt
  • Freshly ground pepper
  • One 3-pound flank steak

Method

  • In a blender, combine the garlic, rosemary, oregano, mustard and vinegar and puree until the garlic is minced.
  • With the machine on, gradually add the oil and blend until creamy.
  • Season lightly with salt and pepper.
  • Add the meat to a glass or ceramic baking dish and pour all but 1/4 cup of the vinaigrette on top; turn the meat to coat.
  • Cover with plastic wrap and refrigerate for at least 4 hours and up to 24 hours.
  • Light a grill and oil the grates.
  • Remove the steak from the marinade, letting the excess drip off.
  • Season with salt and pepper.
  • Grill the steak over moderate heat, turning occasionally, until lightly charred and an instant-read thermometer inserted in the thickest part registers 125, 10 to 12 minutes.
  • Transfer the steak to a carving board and let rest for 5 minutes.
  • Thinly slice the meat against the grain and serve, passing the remaining vinaigrette at the table.