If you ever come to Belgium and visit Gent (Ghent), you should visit Stadsbrouwerij Gruut ( http://www.gruut.be). All her (yes, the brewmaster is a woman) beers are made with gruit instead of hops.I'll make a point of visiting. We haven't made it to Ghent yet but we will. Does she only sell at the brewpub or can you find bottles somewhere? I have inlaws who travel to Belgium for business who could bring some back to France for me.
The brewery is more like a brewpub as the brewing equipment is located inside the café.
I really like the Gruut Wit.