Soak the liver in milk for at least 30 minutes. This takes away some of the liver taste and makes it overall more pleasant. Hopefully you've got good liver that has already been deveined etc. and is in thin pieces, about 1 inch thick. After soaking the liver in milk, take it out, put flour on a plate or something like that, coat the liver in flour, then put the liver in egg wash (1-2 eggs beaten depending on how much liver) now dip it in bread crumbs. Have a pan heated on medium, use either oil or butter, fry the liver about 2 minutes each side, you don't want to overcook it or it will be tough. It's beef so it can be a bit pink. Fry up some onions and bacon if you want, definitely onions, make some gravy, enjoy. If you don't have the bread crumbs you can just dip it in flour after the milk and fry. I've enjoyed liver since I was a young boy, this is how my mom made it.