Add the balsamic vinegar, honey, salt, and chopped rosemary to small bowl, whisking together.
Add the cranberries and balsamic mixture to a recloseable bag.
Gently massage to combine and coat the cranberries.
Using the water displacement method or a vacuum sealer on the Moist setting, seal the bag.
Place the bag into the water bath for at least 2 hours.
To finish the sauce, empty contents of the vacuum bag into a small saucepan and heat gently to reduce and thicken the sauce.
Notes
This sauce can be prepared a few days ahead and quick chilled and refrigerated until ready to use. Serve either cold or warmed per your desire. To warm, simply reheat in a water bath or a small sauce pan.
Recipe by Cooking 4 One at https://www.cooking-4-one.com/2017/12/24/balsamic-rosemary-cranberry-sauce/