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Peeling a cooked egg is easiest when the egg was put into boiling water as opposed to slowly heating the egg from a start in cold water.
Duck eggs tend to have a flavor distinct from, but still resembling, chicken eggs. Tea eggs, a common snack sold from street-side carts in China, are steeped in a brew from a mixture of various spices, soy sauce, and black tea leaves to give flavor. The Chinese salted duck egg is made by immersing duck eggs in brine, or coating them individually with a paste of salt and mud or clay.
Whipping for meringue takes significantly longer, but the final volume is virtually the same.
If a boiled egg is overcooked, a greenish ring sometimes appears around egg yolk due to changes to the iron and sulfur compounds in the egg.
In Thebes, Egypt, the tomb of Haremhab, dating to approximately 1420 BCE, shows a depiction of a man carrying bowls of ostrich eggs and other large eggs, presumably those of the pelican, as offerings. Generally, chicken breeds with white ear lobes lay white eggs, whereas chickens with red ear lobes lay brown eggs.
In 1911, the egg carton was invented by Joseph Coyle in Smithers, British Columbia, to solve a dispute about broken eggs between a farmer in Bulkley Valley and the owner of the Aldermere Hotel. The most commonly used bird eggs are those from the chicken, duck, and goose eggs. Although there is no significant link between shell color and nutritional value, often there is a cultural preference for one color over another (see 'Color of eggshell', below).
Egg yolk becomes a gel, or solidifies, between 65 and 70 °C (149 and 158 °F).
In addition, the protein in raw eggs is only 51 percent bioavailable, whereas that of a cooked egg is nearer 91 percent bio-available, meaning the protein of cooked eggs is nearly twice as absorbable as the protein from raw eggs.
As a cooking ingredient, egg yolks are an important emulsifier in the kitchen, and are also used as a thickener, as in custards.
Some of the most common preparation methods include scrambled, fried, poached, hard-boiled, soft-boiled, omelettes, and pickled.
They also may be eaten raw, although this is not recommended for people who may be especially susceptible to salmonellosis, such as the elderly, the infirm, or pregnant women.