To make the simple syrup place the cranberries, sugar, and water in a medium saucepan over medium high heat.

Bring the mixture to a boil then reduce to a simmer. Simmer for 5-7 minutes, stirring frequently, or until most of the cranberries have broken open.

Strain the liquid through a fine mesh strainer reserving the clear liquid. Discard the solids.

Add the vanilla to the clear liquid mixture if desired.

To make the cocktail fill two glasses with ice.

In a shaker combine the vodka, orange liqeuer, and cranberry syrup with ice. Shake for 30 seconds.

Strain equal parts of the mixture between the 2 prepared glasses. Top each glass with sparkling water and give it a stir.

Top each cocktail with fresh cranberries if desired.