Beef liver is an extremely nutrient-dense food enjoyed by many cultures around the world, but it's best served after thoughtful preparation. When cooked right, beef liver is unbelievably tender and moist – almost velvety. Some tips include soaking in milk for a few hours to remove any bitterness and cooking it quickly on high heat. Cook it over a hot pan with tons of white onion rings, the savory flavors of the onions mixed with the meaty flavors of the liver will make the ultimate comfort food for those cold winter nights.