here is the list of official trappist breweries from the international trappist association website:
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Achel in Belgium: for beer
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Orval in Belgium: for beer and cheese
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Scourmont-Lez-Chimay in Belgium: for beer
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Rochefort in Belgium: for beer
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Westmalle in Belgium: for beer
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Westvleteren in Belgium: for beer
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Koningshoeven in Tilburg, the Netherlands: for beer, bread, cookies/biscuits and chocolates
in my humble but on this point wholly doctrinaire opinion, these are the best ales in the universe.
the fortified ales are less complex in exchange for being more--um---efficient, particularly if the Goal is on the order of dressed up to get messed up.
any of these on tap is a lovely lovely experience.
others that i like, but am less doctrinaire about (there really is no ale but trappist ale---everything else is just, well, less):
la chouffe
la duchesse de bourgogne...this stuff i love (on tap--bottles are good, but kegs are better. not pasturized. all bottled beer coming into the states has to be pasturized. it's ok until you find out there's a difference)
Duchesse De Bourgogne from Brouwerij Verhaeghe
st. bernardus abt 12
Sint Bernardus
yum.
saison dupont is a bit more a country ale, but helps you figure out that beer really was food.
Brasserie Dupont
i like jenlain too.
Brasserie Duyck, the beers : Jenlain, J Absinthe, Gingembre, Torra, Catch the cat, Saint Druon, Frache de l'Aunelle, Spring beer, Christmas beer, Bionelle
for fake belgians, ommegang's abbey double is quite good.
Brewery Ommegang. Belgian brewing in America.
and if you're around philly, monk's cafe makes a sour cherry ale:
Monk's Café Flemish Sour Red Ale - Brouwerij Van Steenberge N.V. - BeerAdvocate
but this really has to be on tap.
but here in tiny town, it is a fallen world. few and far between are the belgians. so one settles for decent local fare. like ipswich ale.
Mercury Brewing Company - Ipswich, MA
but any of the above will prompt you to forget stuff like that exists.
ok enough thinking about beer.