The Easter egg tradition may also have merged into the celebration of the end of the privations of Lent in the West. Historically, it was traditional to use up all of the household's eggs before Lent began. Eggs were originally forbidden during Lent as well as on other traditional fast days in Western Christianity (this tradition still continues among the Eastern Christian Churches). Likewise, in Eastern Christianity, both meat and dairy are prohibited during the Lenten fast, and eggs are seen as "dairy" (a foodstuff that could be taken from an animal without shedding its blood. This established the tradition of Pancake Day being celebrated on Shrove Tuesday. This day, the Tuesday before Ash Wednesday when Lent begins, is also known as Mardi Gras, a French phrase which translates as "Fat Tuesday" to mark the last consumption of eggs and dairy before Lent begins.- Wikipedia
In the Orthodox Church, Great Lent begins on Clean Monday, rather than Wednesday, so the household's dairy products would be used up in the preceding week, called Cheesefare Week. During Lent, since chickens would not stop producing eggs during this time, a larger than usual store might be available at the end of the fast if the eggs had not been allowed to hatch. The surplus, if any, had to be eaten quickly to prevent spoiling. Then, with the coming of Easter, Pascha the eating of eggs resumes.
One would have been forced to hard boil the eggs that the chickens produced so as not to waste food, and for this reason the Spanish dish hornazo (traditionally eaten on and around Easter) contains hard-boiled eggs as a primary ingredient. In Hungary, eggs are used sliced in potato casseroles around the Easter period