The quantities of gin and vermouth stated in this recipe produce a Dry Martini with a 30:1 ratio of gin to vermouth. A small amount of dilution is achieved...
I used this for a palate cleanser after a few horribly sweet drinks, and it's really quite a spectacular kind of martini. High effort, but if you like martinis normally you owe it to yourself to try this once. Also works fantastic with vodka instead of gin!