From what I've read/heard, Candi Sugar (the rocks) adds little more than plain white sugar would. Highly fermentable, not a lot of added flavor. Not a traditional ingredient to Belgian brews, more a bastardization.
This stuff, on the other hand, is supposed to be the real deal:
Quote:
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This sugar syrup is essential for brewing dark Belgian beers, giving more color and caramelized flavor than dark candi rock sugar. Rated at 150 SRM, but will deliver closer to 80 SRM; use 1/4 to 1 cup per 5 gallons. Contains 16 fluid oz.
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IIRC, this is the stuff that's not fully fermentable, the rocks are essentially 100% fermentable and leave little residual flavor. Pretty sure it was in "Brew Like A Monk" I was reading about a lot of pro brewers moving away from the rocks, as they are a very expensive way of adding very little more than gravity points.
Two caveats:
T'aint tried it myself, and the Belgian I just bottle today, using the rocks, well, it
It's not currently available, at least at Northern Brewer.