Wikipedia
Rouladen or Rindsrouladen (also pl. Rolady) is a German meat dish. Usually consisting of bacon, onions, mustard and pickles wrapped in thinly sliced beef which is then cooked. In some countries, the roulade is also known as a beef olive.
Beef or veal is used as meat though some food scholars tend to believe that the original version was probably venison or pork, and pork is still popular in some areas. The beef rouladen as we know them today have become popular over the last century. The cut is usually topside beef or silverside since this is the cheaper cut. The more expensive version would be the round steak, also known as rump steak. The meat is cut into large, thin slices.
The filling is a mixture of smoked and cooked pork belly, chopped onions and chopped pickles (gherkins) which is at times varied by adding minced meat or sausage meat. The mixture varies from region to region. Rouladen are traditionally served for dinner. Red wine is often used for the gravy.