Step 1

Prepare simple syrup by placing sugar and water in a small saucepan over medium heat. Bring mixture to a boil. When sugar has dissolved, reduce heat and add blackberries. Simmer syrup until mixture thickens. Strain out the berries and allow syrup to cool completely.

Step 2

In a cocktail shaker, combine the simple syrup, vodka and lime juice; shake. Pour out the cocktail into glasses filled with ice.