Moeder Lambic Original
or
Moeder Lambic Fontainas
or
Restobieres
or
Brasserie Cantillon AKA "Brussels Museum of the Geuze"
or
Brasserie de la Senne
or
Brussels Beer Project
or
Les Brassins (restaurant)
or
Magritte Museum (token non-beer related choice)
Honourable mentions to Wittamer and Pierre...