A dirty martini usually consists of a shot of gin, which contains 56 calories. Dirty martinis also contain dry vermouth, olive juice and an olive garnish.
To make a delicious dirty martini, add a 2.5-ounce shot of gin into a martini glass. Add 1/2 an ounce of dry vermouth and 1/4 ounce of olive juice to the glass. Stir the mixture gently to ensure that the mixture does not spill over the edge of the glass. Drop two olives into the bottom of the glass and the drink will be ready for someone to serve to guests or enjoy on their own.