SOLERA
Solera
Solera is a process for aging liquids such as wine, beer, vinegar, and brandy, by fractional blending in such a way that the finished product is a mixture of ages, with the average age gradually increasing as the process continues over many years. A solera is literally the set of barrels or other containers used in the process. Products which are often solera aged include Sherry, Madeira, Port wine, Marsala, Mavrodafni, Muscat, and Muscadelle wines; Balsamic, Commandaria, and Sherry vinegars; Spanish brandy; beer; and rums.The above text is a snippet from Wikipedia: Solera
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