Damage or motion of the egg yolk protruding, enough to allow air into the turtle's body results in death.
en.wikipedia.org The pastry consists of a large proportion of butter and egg yolk, besides using corn starch, giving it a rich, buttery, tender and melt-in-the-mouth texture.
en.wikipedia.org The original recipe contained cod liver oil, beechwood creosote, mineral lime, soda, brandy, vitamins, fresh egg yolk and some secret ingredients.
en.wikipedia.org The only source of nutrition for these embryos, however, is the egg yolk, as in externally spawned eggs.
en.wikipedia.org An egg yolk can be used to help the dough rings to stick together.
en.wikipedia.org