In a medium saucepan, melt the butter over low heat. Add the brown sugar and stir until dissolved.
Pour in the red wine and orange juice, then grate in the orange zest. Stir well to combine.
Add the fresh rosemary sprig, salt, and pepper. Simmer the sauce over low heat for 10-12 minutes, or until slightly thickened.
Remove the rosemary sprig and taste. Adjust seasoning as needed.
Serve the sauce hot with steak, grilled duck breast, or other red meats.
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