As a Cork representative at the (very enjoyable) Internations party last night, I was amazed to be asked by so many Ex Pats who weren't originally from Ireland but may have visited or worked there where they could buy Barry's Tea in Brussels?
Barry's is an iconic brand of Tea in Ireland.
Well, in my own area around Schumann / Franklin, you can buy a box of Barry's at Jack O' Shea's butcher shop or in the Swedish Shop on Rue Archimedes just off Schuman. The Swedish Shop also stocks Irish and UK Newspapers.
In an emergency ( for junkies), I always have a spare stash! ;>)
Feel free to share stockists for your own area in Brussels.