My grandmother on my mother's side (German) would clean, cube and freeze the liver.
It was then pulled out and cooked two different ways: breaded and fried, or done in a skillet with onions and salt, then mixed with scrambled eggs.
A neighbor from Hong Kong also cleaned and cut the livers, marinated with citrus and soy sauce (she also used ponzu sauce when lazy) then both wokked it and put into won ton wrappers with bacon.
Now if you have kidneys, I love pork kidneys cooked in butter. No spices, just a fry pan and butter.
My son leaves the house when I do this for Sunday breakfast because he cannot stand the smell.