"OFFAL those parts of a meat animal which are used as food but which are not skeletal muscle. The term literally means “off fall”, or the pieces which fall from a carcase when it is butchered. Originally the word applied principally to the entrails. It now covers insides including the heart, liver, and lungs (collectively known as the pluck), all abdominal organs and extremities: tails, feet, and head including brains and tongue. In the USA the expressions “organ meats” or “variety meats” are used instead."
"Compared with muscle meats, organ meats are richer in just about every nutrient, including minerals like phosphorus, iron, copper, magnesium and iodine, and in B vitamins including B1, B2, B6, folic acid and especially vitamin B12. Organ meats provide high levels of the all-important fat-soluble vitamins A, D, E and K, especially if the animals live outside in the sunlight and eat green grass. Organ meats are also rich in beneficial fatty acids such as arachidonic acid, EPA and DHA. Organ meats even contain vitamin C—liver is richer in vitamin C than apples or carrots! Even if you add only small amounts of organ meats to your ground meat dishes, you are providing your family with super nutrition. . . in ways that everyone likes and are easy to consume."