At the heart of the Sablon, Au Vieux Saint-Martin is more than a Brussels institution, it’s a place where culinary history is served on a plate. Best known as the birthplace of the iconic filet américain, this is where the classic is still prepared the way it should be: finely cut, perfectly seasoned, and served with golden, crispy fries and proper homemade mayonnaise. If you care about filet américain, this is a story you’ll want to read.