This section is from the book "Beverages And Their Adulteration Origin, Composition, Manufacture, Natural, Artificial, Fermented, Distilled, Alkaloidal And Fruit Juices", by Harvey W. Wiley. Also available from Amazon: Beverages And Their Adulteration.
This is a wine made in the sherry district which is derived from a grape which bears this name. The grapes are partially dried on mats in the sun before they are crushed. A very concentrated must is thus obtained, which ferments slowly and produces a product which is so sweet that it is practically a syrup. It is, however, very fragrant by reason of the concentrated essences of the true grape which it contains. It is a wine which is not much used for drinking directly, except in the most minute quantities, but it has a high value as a compounding agent because of the fruity taste it gives to the mixture.
 
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