• a medium saucepan and mixing spoon
• a sieve or kitchen strainer 
• 1 cup sugar 
• 1 cup POM pomegranate juice 
• 1/2 cup frozen or fresh cranberries (or unsweetened cranberry juice)
• a lemon, zested
• 1 orange, zested 
• 2-3 sprigs rosemary

If you'd like to make the syrup in advance:

In a small saucepan, combine sugar and pomegranate juice over medium heat and stir until dissolved. Add cranberries, lemon and orange zest, and rosemary. Bring to a simmer, stirring occasionally. Once simmering, remove from heat and cover. Allow to cool and strain through a sieve or kitchen strainer.