Wash the cranberries and sort through them if necessary. Rinse the rosemary sprig as well, and keep it whole.
In a medium saucepan, combine the balsamic vinegar, red wine, and honey. Heat over medium heat.
Add the fresh cranberries and rosemary sprig and cook for 10-12 minutes, or until the cranberries begin to burst and the sauce thickens.
Remove the rosemary sprig. Using an immersion blender, or by passing the sauce through a fine-mesh sieve, smooth out the texture of the glaze.
Stir in the butter and let it melt completely, stirring constantly until the glaze has a silky smooth consistency.
Season with salt and freshly ground black pepper, then let it simmer for one more minute over low heat.
Serve warm with roasted meats such as duck or pork tenderloin, or alongside cheeses.
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