Directions:

1. Start by preparing the beef slices on a clean work surface. Use a meat mallet for tenderizing, if necessary, to achieve an even thickness. Season with salt and pepper.
2. Spread a teaspoon of mustard over each beef slice, then layer with a slice of bacon, onion slices, and a dill pickle.
3. Roll up the beef slices tightly, securing the edges to keep the filling inside. Use toothpicks or kitchen twine for this.
4. In a heavy-bottomed skillet or Dutch oven, heat the vegetable oil over medium-high. Brown the rouladen on all sides, then remove from the pan.