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. The purpose of this labor-intensive process is the maintenance of a reliable style and quality of the beverage over time. Solera means 'on the ground' in Spanish, and it refers to the lower level of the set of barrels or other containers used in the process; the liquid is traditionally transferred from barrel to barrel, top to bottom, the oldest mixtures being in the barrel right "on the ground". The containers in today's process are not necessarily stacked physically in this way but merely carefully labeled. Products which are often solera aged include Sherry, Madeira, Lillet, Marsala, Mavrodafni, Muscat, and Muscadelle wines; balsamic vinegar, Commandaria, some vins doux naturels, and sherry vinegars; Brandy de Jerez; beer; rums; and whiskies. Since the origin of this process is the Iberian peninsula, most of the traditional terminology is in Spanish and Portuguese.

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