What is "duckefett"

Duckefett is a simple sauce and a regional specialty in northern Hesse, Germany, particularly in Kassel. It is made of bacon, onions, sour cream and occasionally cooked and condensed milk added. As for side dishes, they are usually Duckefett potatoes, potato dumplings, served occasionally. Because of the low-cost ingredients Duckefett was long considered "poor man's food".