Here’s an idea, why don’t you order an egg yolk and cook it with soda water? Sounds like a really weird thing to ask for, but this is essentially how the Egg Yolk Soda is made.

an egg yolk inside condensed milk
If at this point you’re still reading, then I’m sure you’ll enjoy the drink. Here’s the most important thing to remember: if you want to “cook” the yolk by yourself, be sure to tell your server that you want the soda and the yolk served separately. Some restaurants serve the drink in ready to drink form, therefore taking away a part of your experience.

club soda is added
The server will bring out a can of soda, and a glass with condensed milk and an egg yolk in it. Sometimes the ice is included in the same glass. To cook the egg, pour the soda into the glass and stir for a minute, until the yolk is dissolved. If ice is not included in the same glass, it should be in a second glass. You would then pour the stirred soda into the ice glass for consumption. The sweetness of the drink will depend on how much soda you use, although the given amount of condensed milk should be enough to sweeten a full glass of soda.

stirred with club soda
To your amazement, the taste will be far from ‘eggy’. Many people compare this drink to the standard milkshake, but carbonated.

Is this Pho Xe Lua? I recognize the building across the street! Lol i’m a regular there
Egg yolk with condensed milk?? Is this anything like egg nog? The colour looks delicious though.
This is probably the most consistent menu item you could get, although i’ve had ones i liked better than others. not sure why that is..
Hong: it sure is!
Sarah: to be honest, I don’t remember what egg nog tastes like. I’ll have to get back to you another time.
Tuan: I find that the amounts of condensed milk and soda water determine how it tastes
gotcha.
Can I use seltzer water instead of club soda?
I looked up seltzer water and it doesn’t seem like there’s a big difference between seltzer and club soda. You might get the same taste, if not then something very similar.