I eat them every day.
I fell in love with Pho Bo, when I was in Vietnam.
My staple meal, which I have eaten almost every day since starting university this year, consists of the following.
all in a wok:
Fry a few bits of chopped onion and a some slices of serrano pepper in olive oil with ground black pepper, until onions caramelised.
add water to suit size of meal (I generally use about 0.75–1.0L)
Add half a stock cube, a small amount of fennel seed, some more finely chopped onion, soy sauce, a couple of drops of lemon juice, and little ground ginger, and perhaps a small amount of gravy granules, chinese 5 spice (cant remember whats in it) and/or chilli powder. (I use all of the above)
let simmer for a couple of mins, mixing.
add noodles, after a min, add some basil or other chopped herb. I like a tiny bit of fresh mint.
bring to a boil
when noodles are done (3–8 mins, depending on the noodles, be careful), bring off the heat, and quickly add larger bits of onion, beansprouts, chopped pak choi, and sliced raw rump steak.
Mix and pour into a bowl. The steak will gently cook in the heat of the soup
Obviously you can chop and change anything in there to suit, and the quantities to taste.
Good with thin rice noodles or flat (I use either depending on my mood)
I also occasionally do a similar thing, but all as a stir fry, which is also delicious.