First, make sure you get good, fresh calf's liver. You don't want to know from beef liver. I would search out a butcher rather than buying at the supermarket. Slice an onion into 1/4" rings. Add 1 TBS of butter and 1 TBS olive oil to a hot pan. Once the butter is melted add the onions and season with salt & pepper. If you want the onions to brown leave the pan on medium-high heat and let 'em go. They don't need a lot of attention. If you don't want them to color, turn the heat to medium low. THey will take a little longer. In either case, when they are just about to your desired 'doneness', heat another pan on medium-high and add butter/olive oil. Dredge the liver in seasoned flour and shake off the excess. The liver won't take long to cook, 3-5 minutes per side. I like mine nice and pink in the middle. Just one man's opinion. Kyle