Cut bacon into 1/4 inch pieces and fry until crisp. Remove bacon from pan. Discard all drippings except for 2 TBL. Cook mushrooms in drippings until tender (5 minutes) Stir in A-1, Sherry and brown sugar. Add in cooked bacon. Heat to boil. Reduce heat and simmer for 5 minutes. Serve over grilled steak of your choice.