Preheat oven to 350 degrees F.
Cut beef against the grain into thin pieces. Lay flat on table and spread with mustard. Sprinkle with salt and pepper. Place 3 or 4 pieces of carrots, pickles, onions and bacon on each slice of beef. Roll up the rolladen and, if needed, secure with a toothpick.
Sprinkle the top of rolladen with curry, nutmeg, and paprika. Place into a baking pan and cook for 30 minutes. After browning in the oven, cover rolladen with warm water and add bouillon cubes and gravy master. Cover with a lid and finish in the oven for 1 hour.
Then, place in refrigerator until the next day so it can marinate. The next day, take the au jus and place in a stockpot and bring to a boil. Melt butter in a saucepan and add flour to make a roux. Cook over low heat until mixture begins to bubble, stirring constantly. Remove from heat. Whisk roux into broth and bring to a boil to thicken.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.