I make my wife's as follows:
I always keep a bottle of Bombay Sapphire
in the freezer... I also keep a bottle of kettle one vodka in there for the vodka martini drinkers.
1. Take a martini glass and fill with crushed ice then a little water to get it to the top. Place to the side for a minute.
2. Then take glass and empty ice/h20, place a dash of vermouth in the glass. Then swirl around and dump remaining contents.
3. Add already below freezing gin to glass til almost full.
4. Add olives and extra juice (Saca's woman likes it dirty

)
Voila!