For those who have never tried, it may sound a little strange, how come coffee is mixed with eggs? But as you said above, they will get addicted after tasting it. By the way, I've never tasted it served cold, it looks like it's worth a try.
Oh, at my place someone mixes coffee with duck eggs, the taste is also very delicious, you have to try it ;)
Yep it's worthy to try its cold version. About the duck egg, really! How can people make it? They make it the same way?
seems to use the same way as you did too.