We used to add apples, onions, and raisins to the beer gravy when we made liver in Germany (dredge the liver in seasoned flour, brown it, add the onions, raisins, apples cook those until onions are limp, pour in a bottle of beer [or use cider], cover and simmer about 10 minutes. Makes great gravy). I make a German pork roast with apples, onions, potatoes, raisins and either beer or apple cider in my Roemertopf.
Modern Romertopf
I couldn't do the raisins and apples with my liver...bacon and onions only, Thanks!