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Port is a wine made in a specific manner.

The introduction of the port wine which is a sweet fortified wine from the Douro region of Portugal.

wine

Port is a Spanish /Portuguese wine That is much sweeter than most other red wines. For this reason Port can enpart a "sweetness" to a dish that a red table wine cannot. Port "reductions" are found in a lot of dessert applications... I would say an adequate substitute for port used for cooking would be adding sugar to any dark red table wine (cabernet savignon, shiraz, chianti, merlot, etc.)... 1 cup Port = 1 cup red table wine(+2 Tbsp sugar)...