Finely chop the red onion and garlic so they blend easily into the sauce.
In a medium saucepan, heat the olive oil over medium heat. Add the chopped red onion and sauté until translucent.
Add the minced garlic and chopped rosemary and cook for another minute, until fragrant.
Pour in the red wine, bring to a simmer, and cook for 5 minutes to allow the alcohol to evaporate.
Add the tomato puree and stir well to combine.
Add the brown sugar and balsamic vinegar. Reduce the heat to low and simmer for 15 minutes, allowing the flavors to meld and the sauce to thicken.
Season with salt and pepper and cook for another 2 minutes.
Let it cool slightly, then serve with roasted meats, pasta, or grilled vegetables.
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