What is this Vietnamese Food? Several years ago, I had a friend of Vietnamese descent.  She went back to visit her home country and returned with gifts.  I was given a box (possibly yellow) containing several foil-wrapped cubes or rectangles.  They were a sort of caked or compressed powder, and somewhat unpleasant to eat.  I have since lost touch with my friend, but I would love to be able to track down (or at least identify) this food.

I remember that the first ingredient listed was "grease pig."
Does it look like this?  I have some in my pantry now.  (Don't tell anyone.)

By request, the box contents: inside a cellophane sleeve, 4 foil-wrapped cubes.  Here's one:

Texture is very much like a boullion cube - hard, with a bit of sticky give when pushed.  Salty, as expected, but also sweetish with a distinct flavor of caramelized onions and star anise.