The pasty is a sandwich that bakes its own bread around the filling instead of slicing into a loaf. Meat and root vegetables are sealed inside a sturdy pastry shell, crimped shut along one edge, and baked as a single self-contained unit. The defining decision is that the dough is engineered to the cargo rather than the cargo fitted to the dough: the crust has to be strong enough to hold a wet, dense filling through a long bake without splitting, and tough enough to be carried in a pocket and eaten by hand from one end. The crimped seam is the structural spine, and it doubles as a handle in the build's working history.
The craft is in the dough and the closure. The pastry is made stout, not flaky, because flake would shatter and leak; the crimp is a thick rolled rope of dough along the side, the strongest part of the shell and the part you grip while eating in from the opposite end. The filling, classically beef with potato, rutabaga, and onion, goes in raw and finely cut so it cooks through in the time the crust takes to set, the sealed shell steaming the contents from the inside. Nothing is sauced separately because the filling makes its own juice and the dough has to contain it. This was built as a portable hot meal that survived a shift underground, and the design still reads that way: the pasty is engineered to be eaten without a plate, a wrapper, or a knife.
The pasty belongs to the stuffed-pocket family, where the close relations differ by dough and filling. The Nebraska runza and bierock seal seasoned beef, cabbage, and onion in a soft yeast dough. The Fleischkuekle fries the same idea instead of baking it. The West Virginia pepperoni roll bakes cured sausage into the bread itself rather than enclosing a separate filling. Each of those is its own sandwich and deserves its own article rather than being crowded in here.