Combine the cranberries, pomegranate juice and sugar together in a medium saucepan over medium-high heat. Bring to a boil, and then reduce heat to medium-low and simmer for 20 minutes, stirring occasionally to prevent burning.
Then remove from heat, and stir in pomegranate seeds. Refrigerate until ready to serve (and sauce will thicken as it cools).
Notes
Feel free to also add in a cinnamon stick while this cooks to give it an extra kick!