Grilled Balsamic Flank Steak Oh man. This steak. This STEAK! Here in the Mid-west we take our steaks seriously. Grilled Balsamic Flank Steak is a recipe that is worth the try. The flavors from the tangy balsamic vinegar, sweet and tangy Worcestershire sauce, and the sweet brown sugar work really well together. A sweet and tangy melody …