Liver and heart used in "Paprikash" (Hugh Fearnley Whittingstall's "Meat" Book), or just simply fried liver with slow-fried onion&apple (and new potatoes or good mash later in the year). You can use the heart in a stew later (freeze now). I use the lungs for the dog (cooked and frozen in portions), and I have to confess I really don't like the kidneys, so the dog gets those too.