Gueuze is the beer style unique to Brussels and the area around it in the valley of the River Zenne. There are now only about a dozen producers of this beer, which is brewed without the addition of yeast, but using the natural micro-organisms that are native to the area.
Every two years, HORAL, the trade organisation for the producers of this beer, organises the Toer de Gueuze. On one sunday in April, virtually every producer opens its doors to visitors so they can see how this wonderful beer is made. You can make your own way around the producers or you can take a seat on one of a number of coaches that tour around (each coach visiting a different selection of brewers and blenders).
You can sample the beer at every producer and many of them also put on food and entertainment. The day isn't well-publicised outside Belgium, but judging from the number of people I saw when I went on it this year (2005) it's pretty well-known in Belgium. Guided tours round the various producers are only in Dutch, since there isn't really time for multi-lingual commentaries. However, even if you don't understand the language, you'll find the whole experience fascinating (and you'll love the beer.)
Coaches start out from various places around Brussels, depending on the itinerary. Have a look at HORAL's website:
www.horal.be/
to see when the tour's happening; the next one should be in April 2007.
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