Get out a martini glass and shaker.
Run the lime wedge around the edge of you glass (of dip the edge of the glass in lime juice) and then dip the glass in the glass rimmer.
Add some ice to the martini shaker and pour in the vodka and the cranberry juice.
Shake that puppy well.
Pour into the glass and grate the fresh ginger right into the glass.
Give it a little stir, top with the frozen cranberries and enjoy.