There are many styles of food in vietnam. While I only experienced a small portion of what was likely available. There is some food that is delicious, some that is easier to stomach and some that my pallette could only take once. Here are some pictures of what I saw.
On the way to hanoi on korean air business class they fed me a couple of times. Both times i picked korean food. In the picture below I can remember what it was called but the meat was tasty. However the beef was served with very large chunks of fatty gristle which I could not eat. The peppers (top left) were good, however the vinegar / pickled veggies (top middle) had an overly pungent vinegar flavor and I only ate one.
The easiest consumable to deal with was beer, and we found plenty of it. The tastiest though is not from vietnam, it is tiger beer from thailand and I will search it out when I get home. I really like it. Vietnam beer has a distinct taste of a somewhat un natural chemical. I found the sam flavor in a noi beer and in Saigon beer. (Although Saigon beer us better because it has less of the taste)
In addition to local beer it seems the country loves it's German beer. We happened into many places that specialized in German beer only (and we also found an Austrian beer festival)
Heineken found it's way into many citywide travels as we found different caberet, gay, techno clubs and after hours tombs (wait was that all one night)
Aside of beer we also stopped by what looked to be a chain of some sort that had fried chicken (GÃ ) and saw the gang Nam guy sponsoring some sort of korean juju or wine. We ordered it ip and found it to be filtered sake.

While the beer and wine was good, really they were not really unique in any significant way. But the coffee was. For some reason every one seemed to think that vietnam coffee was amazing, but the coffee itself seemed about the same to me. The unique aspect was how they served it. Anytime you ordered coffee they asked if you wanted it hot or iced. I always took it hot. They would also ask if you wanted it with cream, and here is where the whole country is somewhat inconsistent. Some places serve it black with a side of cream, others serve it with cream added others will use sweetened condensed milk. And this last one is what I really like. The sweetened condensed milk goes to the bottom and has to be stirred in order to mix. Sometimes they would give a very small amount and sometimes much more (I liked much more).
They always served it in the same style cup, and I always drank all of it.
Back to food, the best of all food is certainly Pho (said "fah") noodles in broth with either chicken or beef and green onions sprouts and parsley (I pick around the parsley) typically there is something cilia sauce, hot peppers and other veggies. The beef is added when it is only partially cooked and it finished cooking in the broth.
It is tasty and unique, yet it does not have foreign flavors that could turn off my taste buds. Even though I ate it many times it appears I only have one photo.
Pho was common at breakfast even though it seems more like an American dinner. Another breakfast food for me was congee, a grits or oatmeally like textured rice dish, with sides of peanuts, some sort of onion straw bits, eggs and century eggs. The first time I had it I ate every drop, it was sweet like it already had brown sugar and butter in it (that's the way I like my oatmeal). But by the end of the week, my stomach had started to tense up a bit at the sight of it so I stopped eating it. I think I will try again in the future, but I might add my own sugar since it did not seem to have enough after the first time
--no picture of the congee--
Also note able is the street food, almost any food could be found on almost any street with varying levels of cleanliness. One that I liked was the chicken and hot dog like meat on a stick. They were already cooked most of the time and sitting in the open air waiting for you to order. Then when you order they would heat it up again by setting it on the coals. (I thought it was cool when they used a beat up fan tk blow on the coals and make them extra hot)
A suprise treat was some un identified food, it was about 7pm and a random corner was packed with people so doug and I sat down and let this guy ask what we want, we pointed at a rice dish and said 2. Pretty quick we were given rise with some sauce which was about 50/50 mixed with the rice (so it was not rice with a sauce,it was more like a sauce with some rice in it) the dish was delicious and I tried to take a picture of it so I can figure out what we just ate.
We also has fried chicken at the vietnamese version. Of buffalo wild wings. Nothing special here except that possibly because it was a chain I had problems getting them to give me some of the delicious sauces they had on the wings, put on to the chicken strip which were boneless. Ultimately I just ordered chicken strip with a side of chili sauce. They came back and said there would be an extra charge I said how much and they said I will check, she came back and said there would be no charge. I got my chicken strip but the side never came..I guess that what I get for being picky about chicken bones.
At one point we were walking around the railroad station, and we realized there were very few tourists, I suggested we get something to eat and Doug says "like rat" and I say "probably not" and then I realize why he said it

we did not eat anything on that street even though it appeared that later on down that street there was a flow of water raising up from the sidewalk as though the whole place was built on a fresh natural spring.
Even though the place is full of ethnic vietnamese food, there is still lots of foreign food which is easier on the stomach. We has beef fried rice at an German beer restaurant