Amazing the topics that will draw a million replies... or so it seems! Here in the western U.S. wild game liver is excellent and always saved when field dressing the animal. Elk, antlope (actually "Pronghorn Antelope") deer, but our favorite, since it's so readily available is calves liver.
A 1/2 inch "steak" of liver... a quick dredge in milk, then flour, plopped in a cast iron skillet with a little lard or bacon grease, thusly fried for about 3 minutes a side, heat reduced and goodly mound of freshly sliced onions under a tin lid to stream for maybe another 3-4 minutes... We only indulge maybe once a month, though due to the high cholesterol content of all liver...(Chicken livers are cherished in our Southern states... fried the same as above sans onions...)