Wash the tomatoes, then dice them into small cubes. Peel and finely chop the onion and garlic.
In a medium saucepan, heat the olive oil over medium heat.
Add the red onion and sauté until translucent, then stir in the garlic and chili flakes.
Add the diced tomatoes and a sprig of rosemary, then cook over medium heat for 10 minutes.
Sprinkle in the brown sugar, pour in the balsamic vinegar, and stir well.
Cook for an additional 15-20 minutes over low heat, until the tomatoes have completely broken down and the sauce has thickened.
Remove the rosemary sprig, then season with salt and freshly ground black pepper to taste.
For a smoother consistency, use an immersion blender to purée the sauce, or strain it through a fine-mesh sieve.
Serve warm with grilled meats, roasted vegetables, or alongside burgers.
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