The sandwich is one of those dishes that has it all: it's prepared in minutes, easy to make, and can be taken to the office or school. Although the most common are club sandwiches or ham or chicken sandwiches, there are also more gourmet recipes, like this flank steak sandwich recipe; you will love the flavor of the marinade!Moreover, this flank steak sandwich is made with Matambre Proan®, so the quality and taste of your dish are 100% guaranteed, give it a try!Did you know? It is said that the aristocrat John Montagu invented the sandwich in 1762.