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Vermouth is wine infused with herbs, alcohol, sugar, caramel and water
according to specific recipes in Italy and France.
There are three types of Vermouth:
Dry vermouth is white, usually 18 percent alcohol (36 proof) and contains at
most 5 percent residual sugar. It's drunk as an apéritif and is a vital part
of the dry Martini.
Sweet vermouth is white (bianco) or red (rosso) and is usually 15-16 percent
alcohol (30-32 proof) with up to 15 percent sugar. It is also used as an
apéritif as well as in slightly sweet cocktails such as the Manhattan.
Half-sweet vermouth.
Note: One of the major producers of vermouth is the company Martini, not to be
confused with the Martini cocktail. Always ask your customer whether she/he
means a Martini cocktail or a vermouth when she/he orders a Martini.
---------------http://www.barnonedrinks.com/tips/dictionary/v.html
Vermouth
A wine flavoured with herbs, spices, barks and flowers. Can be found in
different varieties (red, white, dry, sweet, etc.), and is produced mainly in
France and Italy. The most common herbs and spices used to make vermouth are:
angelica, bitter orange, cinnamon, cloves, coriander, gentian, hyssop,
marjoram, sage and thyme.
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Vermouths are enhansers. Dry Vermouth does not interfere with the flavor of a
drink.