Zwiebelrostbraten is a traditional dish that's served in most German and Austrian restaurants in Bavaria and Vienna, respectively. The dish is usually made with a combination of beef (sirloin steak), onions, flour, oil, butter, paprika, Dijon mustard, cream, beef stock, salt, and pepper.

The onions are sliced into rings, dipped in a mixture of flour and paprika, fried in oil, and set aside. The steaks are lightly pounded, seasoned with salt and pepper, coated with flour and paprika, fried in oil and butter on both sides, and removed from the pan.

The fried onions are returned to the pan with mustard and beef stock, and the mixture is cooked until the juice are reduced. Cream is added to the pan and everything is simmered for a few minutes. The steaks are added to the sauce, and the dish is then served with spätzle or potatoes on the side.