Finely chop the rosemary, garlic, and ginger. Measure out all the ingredients so they are easily accessible during cooking.
In a medium saucepan, heat the olive oil over medium heat. Add the garlic and ginger and sauté for 1-2 minutes, until fragrant.
Pour in the red wine and white wine vinegar, then add the brown sugar. Stir to combine, and cook over medium heat for 5-7 minutes, or until the liquid has slightly reduced and thickened.
Add the chopped rosemary, then reduce the heat to low and stir in the butter. Continue stirring until the sauce becomes silky smooth.
Season with salt and black pepper to taste. For a more intense flavor, add a little more rosemary or ginger.
Let the finished sauce cool slightly, then serve with roasted meats, grilled vegetables, or pasta. It can be stored in the refrigerator for up to 3-4 days.
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