Authentic German Rouladen is a classic dish made with thinly sliced beef, filled with a flavorful mixture of onions, mustard, pickles, and bacon. The beef rolls are then seared and simmered in a rich gravy until tender. This dish is a favorite in Germany and is often served with mashed potatoes or spaetzle. The combination of savory beef, tangy pickles, and smoky bacon creates a delicious and comforting meal.