Add ice to your shaker. Add all four ingredients to the shaker and shake for about 30 seconds. Strain into martini glass and enjoy!
I store my vodka in the freezer to keep it icy cold.
I like to crush my ice before I add it to my shaker. When I am shaking it some of the crushed ice melts and also a few tiny pieces get through my strainer into my glass which I like. If you don't want tiny ice particles in your drink than use regular ice instead of crushed.
I have used a pitcher with a tight fitting lid to make several at once and they turn out great.