Eggs with two yolks are a natural phenomenon over which we have no control.
Double yolk eggs are larger than those laid by the majority of the flock and are set aside to be tested individually.
Demand for double yolkers far outstrips supply and we need to be very sure that they do in fact contain two yolks.
Therefore, each egg is checked by holding it against a bright light.
During this process, still known as candling from the days when a candle provided the source of light, the number of yolks will be clearly visible as shadows.
Try it at home, you’ll be surprised how much of the inside of an egg you can see.
