Cut the meat into slices, tenderize, season and spread mustard on eachb slice. Roll bacon around the prunes, place them on the meat and roll up each slice, wrapping with cotton thread. Fry the rolls in a frying pan, then place them on a pan and into the oven, pour the stock over them and stew. Use the stock from stewing to make the sauce with the prunes, puree the mixture and thicken with cream.