Each 500g carton contains 15 free range egg whites and has no preservatives, but thanks to pasteurisation Two Chicks egg white does not present the health...
Perhaps also worth mentioning that if you freeze it on the day of purchase, it will last up to two years. So if you only plan on using it for the odd cocktail you can divvy it up into small portions and just take it out of the freezer as you need. No waste!
Now I’ve discovered Vegg White, I’ve given up using egg white. Even after opening, Vegg White will last for a month in the refrigerator. No waste, no hassle and no wet dog smell.
I froze half a pack of the Two Chicks egg white in 10ml doses in an ice cube tray, and then tested defrosted cubes against the never-frozen product in a cocktail head-to-head. There was no noticeable difference in the foam, not visually, in mouthfeel nor longevity.
Freezing works.
(It seems, sod's law, that every recipe I looked at thereafter asks for 15ml eggwhite, cf 10ml or 20ml, but 10ml works well enough for me)