Buttered eggs is a traditional technique of preserving eggs, originating from Cork. In order to prepare buttered eggs, it's important to have freshly laid, warm eggs that are taken directly from underneath a hen. A thin layer of butter is rubbed around the eggs.

In the process, the eggs are sealed airtight and can be preserved for a few months because the eggshells are porous and the buttery flavor permeates the eggs. Once buttered, the eggs are typically stored in egg cartons and placed in a dark and very cool place.

In the past, before the advent of refrigeration, this was a great method for preserving eggs and enjoying them during winter, when hens produce less.