well not really if you want to find out go freez a yolk
To safely freeze egg yolks for future use, first separate the yolks from the whites. Add a pinch of salt or sugar to prevent them from becoming too gelatinous. Place the yolks in an airtight container or freezer bag, making sure to remove as much air as possible. Label the container with the date and number of yolks. Freeze for up to 3 months. Thaw in the refrigerator before using.
Some eggs have two yolks because two yolks were released from the hen's ovaries at the same time and ended up in the same egg.
If you plan to freeze eggs, do not freeze them in the shell. The shells will split. Crack the eggs, beat until blended, than package in air tight containers. The frozen egg mixture can be good up to one year. You can also separate the white and yolks and freeze separately, but yolks need extra preparation since they can become quite gelatinous. According to the Egg Board, after separating the yolks, blend in either 1/8 teaspoon salt or 1.5 teaspoons sugar or corn syrup for every 4 large egg yolks (1/4 cup) - then freeze.
tempering
tempering
Same as eggs, you just separate the yolks.
yolks - like egg yolks
Yes! The yolks have nutrition and energy for you.
It is not generally recommended to freeze a whole, in-shell hen's egg. The liquid of the egg would expand and crack the shell. If you'd like to freeze the eggs for later use, break them out of the shell and either separate the eggs and the whites or beat them together. Add a little salt, sugar or corn syrup to egg yolks (see link). Then package in single-use units - like an ice cube tray - and freeze.
No, I am afraid not. To make ice cream you need to make an egg custard (milk + a little cream, egg yolks, sugar and vanilla). Then freeze that.
Double yolks are not that rare. Double yolks are a result of two ovum being released to the hens oviduct at the same time.
Nothing, I'm afraid. Egg yolks are very niche in their properties, as such they have no good substitutes.