they show us. what's in here? egg yolk and sugar, and then the milk. this is very advanced. it used to be by hand? >> yeah. >> reporter: our first taste test. delicious. then, pouring the vietnamese coffee over the top. we take three staircases up and wait. all right, let's try it. our egg coffee ready. it's even better with the coffee, right? >> right. >> reporter: and then a toast. to vietnam. >> to vietnam. thank you for being here. >> reporter: the coffee -- it leaves its mark. you have it, too. we see the americans wave from afar. so you're from the u.s.? >> yes. >> reporter: where are you from? >> new york. buffalo, new york. >> reporter: buffalo, new york. upstate new york. syracuse. >> oh, yes, that's right. >> reporter: we survive the winters together. >> we certainly did. >> reporter: you came all this way for egg coffee? >> yes, we did. >> reporter: they call this pho co, the oldest district in hanoi. and you can see, you can find just about everything here.