Into a cocktail shaker, drop in the mint leaves and muddle them until the leaves begin to break apart. 
Add mint syrup and lime juice.
Next, add several fresh ice cubes.
Pour in the vodka and cranberry juice.
Secure the lid and shake vigorously for 30 seconds.
Divide the mixture into two standard rocks glasses filled with fresh ice.
Top with ginger beer.
Garnish with whole cranberries, and sprigs of fresh mint, and wedges of lime. 
Serve.