Berliner knüppel is a traditional bread roll originating from Berlin. The bread rolls are usually made with a combination of water, flour, milk, yeast, and salt. The ingredients are mixed, the dough is kneaded, and it's then left to rest for a while.
The balls of dough are pressed into disks that are folded into a halfcircle, and the dough is then rolled into a short and oblong log. The rolls are baked seam-side up in an oven with steam until golden brown. If properly baked, the crumb should be soft and fluffy, and the crust should be slightly crusty.