Step 1

In a small saucepan over medium heat, combine the cranberries, water, and sugar and stir until the sugar is dissolved.

Step 2

Cook, stirring frequently, until all the cranberries have burst, about 10 minutes. Remove from heat and let cool.

Step 3

Strain the syrup.

Step 4

Fill 4 glasses with ice.

Step 5

In each glass, combine 2 ounces cranberry syrup, 1 1/2 ounces vodka, and the juice from 1/2 lime. Top off with ginger beer and serve immediately.