Finely chop the red onion, garlic, and fresh rosemary. If the capers are large, chop them into smaller pieces as well.
In a medium saucepan, heat the olive oil over medium heat. Add the red onion and garlic and sauté for 2-3 minutes, or until translucent.
Add the red wine, then stir in the tomato puree and brown sugar. Cook over medium heat for 5-7 minutes, or until the sauce has slightly thickened.
Add the capers and chopped rosemary, then stir well to combine. Cook for an additional 5 minutes to allow the flavors to meld.
Season with salt and black pepper to taste. For a smoother sauce, use an immersion blender to puree it; alternatively, serve it chunky.
Allow the finished sauce to cool slightly before serving with pasta, grilled meats, or fish. Store in the refrigerator for up to 3-4 days.
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