It should last a while if it has never been opened. After it has been opened it lasts as long as an opened bottle of port or sherry, and starts showing some off flavours in a month or two.
No vermouth
its actually known as "London dry gin" which in this case the dry comes from the maker removing the vermouth for an extra dry gin or adding little vermouth for a dry gin. vermouth is the adding of aroumatic herbs or spices causing the gin to have a particular smell.
It is a gin or vodka martini made with no vermouth
There are about 157 calories in 3.5fl oz of dry vermouth.
When someone asks for a 'dry' martini it means that they want a martini with one specific liquor (either on the rocks or up) and with dry vermouth. If someone asks for an 'extra dry' martini it means that they only want the liquor and NO vermouth. I know it sounds backwards, but that is the terminology.
6 oz of dry vermouth is 4 points.
8 ounces in a cup.
A dry white can be used in place of vermouth.
Sweet vermouth (the other kind, dry vermouth, goes into regular gin and vodka martinis).
Vermouth sauce is generally a reduction of dry vermouth with chicken stock and herbs. If you have made a roast chicken for example, you can use the vermouth to deglaze the roasting pan.
Noilly Prat is the top selling dry vermouth in the world. It is a very high quality product. Dolin is another very good dry vermouth. When Ian Fleming wrote Casino Royale, ,he substituted a French aperitif wine called Lillet for the vermouth. Lillet is a dry wine with bitters and orange with hints of oak.
A dry martini is a cocktail made with gin and dry vermouth. Martini Dry is a brand of dry vermouth, which is an ingredient in a dry martini. Martini Dry is also served on its own, often poured over ice cubes and garnished with a lemon twist or lemon wedge. Americans ordering martinis in Europe are often surprised when they get a glass of Martini Dry instead of a dry martini cocktail.