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Flank Steak with Rosemary Mushroom Pan Sauce

Flank Steak with Rosemary Mushroom Pan Sauce pairs tender, seared beef with a rich, buttery sauce studded with mushrooms, shallots, and fragrant rosemary. The concentrated beef broth deepens the umami, giving each slice a steakhouse-style finish without fuss. Serve this satisfying dish for a cozy weeknight dinner or a simple yet elegant weekend meal alongside roasted potatoes or greens.

  • Prep20 mins
  • Cook20 mins
  • Serves4
  • DifficultyMedium
Flank Steak with Rosemary Mushroom Pan Sauce
  1. 1

    Heat 1 tablespoon oil in a 10-inch skillet over medium heat. Add the beef; cook until well browned on both sides and it reaches your preferred doneness. An instant-read thermometer inserted into the center should read 130 degrees F (63 degrees C) for medium-rare, about 10 minutes. Remove the beef from the skillet.

  2. 2

    Heat 1 tablespoon butter and the remaining 1 tablespoon oil in the same skillet. Add the mushrooms; cook, stirring occasionally, until tender, about 5 minutes. Add the shallot, garlic, and rosemary; cook until just fragrant, about 30 seconds. Stir in the concentrated broth, water, and the remaining 1 tablespoon butter until the butter melts. Remove from the heat.

  3. 3

    Cut the beef diagonally into thin slices against the grain. Serve the mushroom sauce over the beef.