Flank Steak Sandwiches

Flank Steak Sandwiches

  Flank Steak Sandwiches with Greens and Aioli 1.25 pound flank steak1 teaspoon coarse kosher salt, or more to taste1/2 teaspoon freshly ground black pepper, or more to taste1/2 cup grated Parmesan cheese1/3 cup mayonnaise2 tablespoons prepared horseradish2...