Season the roast venison and fry it in a saucepan. Add the vegetables and tomato paste and roast, deglaze with red wine. Pour in the game stock, let it cook slowly and put in the oven at 180 °. About 2 hours.
When the meat is done, take it out of the pot and carve it.
Mix the sour cream with the flour and cook for 5 minutes and strain.