Fairly well carbonated, the beer foams a bit as it hits my tongue. The beer is only softly tart when compared to a Lambic, but it does produce a nice acidic taste. Flavors of tart grapefruit are noticeable from the get go and as the beer moves towards the finish it starts to taste a bit like artificial grapefruit concentrate (stems from the esters & acidity that create the grapefruit flavor along with a bit of phenolics thrown in). Fairly light bodied, though it does have some heft to it. Somehow it gives the sense of some tannins and a touch of oak character, though I don't think any wood ever touched this beer. This last leads to a bit of astringency that along with the acidity provides a bit of the finishing balance that is typically supplied by hop bitterness. A touch of cheesiness in the finish keeps this from being clean by Lambic standards; what this really means is that this beer is a probably a bit young.
An interesting beer, certainly a tribute to the Zenne valley, though not really a Lambic in "style". Tasty though & certainly worth trying and sitting on a couple bottles for a while. Purchased: Plaza Liquors, Tucson AZ