Sprinkle the meat with salt and pepper and fry in a saucepan with a little oil. Stir the roast and delicatessen sauces with a little water and bring to the boil. Stir in the cream and gradually the prosecco. Add the herb butter and mustard and stir in, then simmer. Let simmer for 1 - 2 hours for really good taste.
Prepare the spaetzle according to the instructions on the packet and serve with the shredded meat.