Inexpensive, protein-rich, and easily cooked: the egg. The egg has been one of the most valuable foodstuffs since the Prehistoric Age. Bird eggs have been used and consumed wherever birds (mostly chickens) are domesticated. “Scrambled eggs” originated in 17th-century France. They pair well with acidic fruit juices, and “dried eggs” first developed during the 19th century and were used predominantly for soldiers in World War II. Why are they so popular? Eggs work in both sweet and savory meals, including many baked goods such as cakes and pies.