Castle Malting. Special "B" is a unique Belgian malt that has a definite roasty or toasty flavor consisting of dark caramel, toasted marshmallow, and raisin. Used in moderation in the grain bill (1%-5%), it is very good in brown ales, porter, and doppelbocks. Larger amounts, >5% of the grain bill, will lend a prune-like flavor to abbey ale styles like dubbel. Several other maltsters make a similar 150L-180L product under various names, but Special "B" was the original.