The sirloin, or porterhouse, is a wonderful steak that grills to tender perfection in a matter of minutes yet is full flavoured and completely delicious. It sits on one side of the T-bone, the fillet on the other side. It has a thin line of fat on the exterior that, for many, is part of its appeal.  This is a modern take on the old-fashioned steak sandwich. This is more delicate, easier to eat, and perfect for casual meals or even party food. We just love the recipe for quick pickled onions. If you make too much, store them in a container in the fridge and use in salads or other meat dishes.