In large skillet, brown beef and bacon until red color disappears. Drain.  In crockpot, mix together drained beef, bacon, onion, flour, paprika, and salt. Stir in undiluted soup.  Cover pot and cook on low 4 to 5 hours. Stir in sour cream.  Spoon mixture over toasted buns.  Serves 6 to 8.  Buttered noodles can be used instead of the buns.

In large skillet cook bacon several minutes. Remove bacon and set aside. Coat beef with flour and brown on all sides in bacon mixture.  Combine steak, bacon drippings, cooked bacon, seasonings, and bouillon  in crockpot. Cover and cook on low for 6 to 8 hours or until meat is tender. Turn control to high.  Add cornstarch (dissolved in 2 tablespoons water);  cook on high 15 minutes. Serves 6.  NOTES : Can add 1/4 pound fresh mushrooms during last 15 minutes, if desired.