In Belgium you can expect to eat quite cheap. I never pay over 20 EUR for a 3-course lunch or a decent dinner. Just walk the extra 250m from the city center, and be assured to pay less and get less touristy options. I can give you lots of good ideas if you have further questions, for I am a 54 year old "Brugger".
As written in a comment by @jcaron:
The ticket pick-up is in the southern passageway, close to platforms 1-6. It's 'behind' the Eurostar area if you come from the main passageway. Hard to find a map where it's visible.
Quote slightly doctored to make it easier to understand.
The map is no longer available, site is now private.
I found two maps of the ...