Balsamic flank steak and mushrooms
Instructions:
- In large plastic bag, combine vinegar, soy sauce and sugar; add steak. Seal and refrigerate for 8 hours. (Make-ahead: refrigerate for up to 2 days.) Remove from marinade, reserving marinade.
- In skillet, heat oil over medium-high heat; cook onion and garlic, stirring, until translucent, 3 minutes. Add mushrooms; cook until liquid is evaporated, about 10 minutes. Add reserved marinade; cook until no liquid remains, about 5 minutes.
- Meanwhile, broil steak, or grill over medium-high heat, for 7 to 9 minutes per side for medium-rare. Transfer to cutting board. Tent with foil; let stand for 10 minutes. Slice thinly across the grain. Serve with mushroom mixture, sprinkle with parsley.