Wrap each piece of meat in a rasher of bacon, and put a little butter in a heavy frying pan, or skillet, with a lid. Cook the pieces for about 6 minutes on each side, and then put them on a serving dish and keep warm while you make the sauce. Put a quarter of a pound of butter in the pan with the sliced onions and mushrooms, the bay leaves and a pinch of thyme and caraway. Let this cook for 5 minutes or until the onions are golden, then add the wine, simmer for a little longer until the vegetables are cooked and add the fresh cream, and allow to cook for another 10 minutes. Remove the pan from the heat and add the sour cream, salt, pepper, and Worcestershire sauce to taste, and the lemon juice. Heat but do not boil. Pour the sauce over the meat and serve immediately.