Williams & Humbert’s Dry Sack 15-year Oloroso is the first sherry we’ve formally reviewed here, and it’s a doozy. This is actually a blend of two sherries, a dry oloroso (78%) and Pedro Jimenez (22%), each blended separately with the solera style (in which wines are aged in a series of casks, with a portion of wine from each cask is progressively moved into the next-oldest cask every year until a tiny bit is finally drawn off the oldest cask and bottled, in this case after a total of 15 years through the process). The result is a cryptic wine, dark oak in color and 20.5 percent alcohol. The nose is filled with raisins, but a nutty character becomes quite palpable as the raisin-like sweetness fades. The finish is spicy, with allspice and mulled wine;