Liver is one of the most nutritious organs that can be eaten. A slice of liver supplies 40 percent of the daily value of protein needed which helps to repair cells and create certain enzymes. Also, a slice of liver provides 2,000 percent of the adult recommended dietary allowance for vitamin B-12. Liver is considered a delicacy in some countries, but is a cheap and nutritious purchase. However, because of the high nutritional value only small amounts of liver should be consumed weekly. Liver and onions is the most popular way to cook liver, but liver can be can be cooked in a multitude of ways. Liver is easily sautéed, but can be baked, broiled, and even grilled.