Prepare the ingredients: peel and finely chop the garlic, and roughly chop the rosemary sprig.
In a medium saucepan, melt the butter over medium heat. Add the chopped garlic and sauté for 1-2 minutes, until fragrant.
Pour in the red wine and apple cider vinegar, then stir in the honey. Mix well until the honey is dissolved.
Add the rosemary, salt, and black peppercorns. Bring the sauce to a boil, then reduce the heat to low and simmer for 15-20 minutes, or until the sauce has slightly thickened.
Taste the sauce and adjust the flavors as needed, adding more honey for sweetness or apple cider vinegar for tanginess.
For a smoother sauce, strain it through a fine-mesh sieve or blend it with an immersion blender.
Let the sauce cool slightly, then transfer it to a clean, airtight jar. Store in the refrigerator for up to one week.
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