Heat one tablespoon of oil and fry the venison for 5 minutes over medium heat, stirring. Each piece should be covered with a crust. Then transfer the venison to a plate.
In the remaining frying oil, fry the onions and mushrooms for 7 minutes, stirring. Add garlic, fry for another 1 minute.
Add flour and stir, fry for another 2 minutes. Pour in the broth and stir until all the lumps of flour are broken up. Then add salt and spices. Stir and cook covered for another 3 minutes.
Add sour cream, stir and bring to a boil, wait 3 minutes. Add venison, stir and cook for 5-7 minutes. Try the meat - it should be soft. If it is not soft enough, cook for another 10-15 minutes, adding water or broth if necessary if sauce gets too thick until the meat is as tender as you'd like.