Slice the mushrooms and onions Cut the beef into long strips and season with salt and pepper Heat some olive oil in a dutch oven and brown the beef in batches Add a knob of butter and sautee the onions and mushrooms Season with salt, pepper, paprika, cayenne pepper Add in the beef and 1/2 liter of water Cover and cook till the beef is fork tender and the liquid has reduced by half or more Add in the sour cream and heavy cream and mix in well Turn off the heat and garnish with chives/spring onions green