First cook the meat in a roasting tube in a preheated oven at 180 ° C for about 90 minutes. Then let it cool down.
Cut the cold meat into slices and place in a baking dish. Put the remaining ingredients in a saucepan and heat - but do not boil! Then pour this mixture over the meat slices.
Reheat in the preheated oven at 200 ° C on the 1st rack in the oven for another 30 minutes.