I have a friend who used to manage an egg packing plant. You don't want to know how that "liquid egg product" is made. They would sell 10L bags of "pasturised egg", which was made from the cracked and broken eggs that didn't make it through the sorting process. Part of the processing is a filter that is used to separate maggots from the mixture. The resulting mixture obviously needed to be pasturised so it was "safe" to eat, it also had a very long shelf life. That sort of shit was sold to bakeries and larger manufacturers who used egg, so if you buy a cake from the supermarket or a larger chain bakery, it's likely using something like this.