Beef Rouladen, also known as Rinderrouladen, are a cherished German comfort food. These savory beef rolls are filled with a delightful combination of flavors: bacon, onions, mustard, and pickles. Slow-cooked to perfection, they’re bathed in a rich, velvety gravy that will leave you craving more. Whether it’s a cozy Sunday dinner or a festive occasion like Christmas Eve, Rouladen always steal the show. Ingredients Thinly Sliced Beef: You’ll need slices of beef, at least 4×6 .