The Cantillon brewery is closely linked to Brussels, a city which has the iris as its symbol. As the name indicates, the "marsh iris" is a plant growing in humid areas. The historical center of Brussels is built on swamps where this flower used to grow abundantly.̴Ì_
In 1998, the Brussels Museum of the Gueuze celebrated its 20th anniversary. The Cantillon brewery decided to make a new spontaneous fermentation beer for this occasion, named after this symbolic flower.̴Ì_
It is a completely original beer which, contrary to the other products of the Brewery, is not brewed with 35% of wheat. The Iris, which is only made with malt of the pale ale type (giving a more amber colour to the beer) conserves the typical flavour of the spontaneous fermentation, the complex aromas and the vinous taste.̴Ì_
The hopping is different too. Lambic is made with 100% dried hops, for the Iris we use 50% of dried hops and 50% of fresh hops. The latter cause a superb acidity, the former, due to their tannins, enable to conserve the beer while preserving all its qualities.̴Ì_
After two years in the barrel, the Iris undergoes a second fresh hopping two weeks before the bottling. A linen bag, filled with hops, is soaked in the beer for two weeks. This technique, called "cold hopping", gives the beer a more intense savour and makes the smell and the taste more bitter.