Here are the 2 sauces available. Left is the special sweet sauce used for the pork. Right is the typical fish sauce. My family doesn't like using the special sauce for their pork. I don't know why. I, on the other hand love that sauce. I'm just way more hardcore at eating Vietnamese food than them.
This is Bun bo Hue. It's a popular soup noodle dish that is made with beef, oxtail, pig's knuckles, or pork and also has cubes of pig blood inside. Like all asian things, it sounds gross but tastes delicious!