(uncountable) A method of producing sherry in which small amounts of younger wines stored in an upper tier of casks are systematically blended with the more mature wine in the casks below.
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(countable) A large winecask, on the bottom tier in this system, that contains the oldest wine.
Frequently, Port wine makers use a solera to accomplish this task.
Wine from later pressings aged in a solera system of well seasoned American oak barrels.
Tawny port is usually aged through a solera, resulting in golden colored wines with light sweetness and warm flavors.
What makes Port unique, however, is the process by which it is made and aged using a solera system, which is a method of aging fortified wines and liquors by blending vintages.