If you're looking for Jewish chopped liver, you can't use butter. My mother made it with rendered chicken fat. If you can't buy it in the tub, render it yourself by just cooking the fatty chicken skin until there is a lot of liquid fat and the skin is brown and reduced to "griebenes" (cracklings).
My mother used a lot of hard boiled eggs and sweet onions so we kids would eat it. I prefer it like that to this day, not as "livery" as some.
Simple recipe: 1 hard boiled egg to every 2 livers. First, cook the liver in the chicken fat until cooked through, not pink, but not overdone and tough.
Next, cook chopped sweet onion....one large one to a lb. of liver. Use as much as you like, this is one of those recipes you can fiddle with. Cook onions until caramelized. Set aside.
Using food processor, chop up eggs, cooked livers and onions, including the liquid chicken fat. If there is any burned stuff in it, don't use that stuff, melt some more and add it a little at a time, pulsing the mixture, adding salt and some garlic powder if you like. Taste it and add salt, pepper and chicken fat if it seems dry.
That's it! Enjoy on rye bread or crackers. Man, I want some now!
If this recipe isn't "livery" enough for you, just omit some of the eggs. But everybody I've fed this to has gone nuts over it, Americans, Europeans, different cultures, all loved it. My Japanese husband adores it.
One other thing, if you have an electric skillet, you can cook the liver and onions outside and have no smell of cooking in the house!