Finely chop the red onion and garlic.
In a medium saucepan, heat the olive oil over medium heat. Sauté the onion and garlic for 2-3 minutes, until fragrant.
Add the tomato paste, then stir in the fresh rosemary sprig and cinnamon.
Pour in 100 ml of water and cook over medium heat for 10-15 minutes, until the sauce has slightly thickened.
Add the honey or maple syrup and balsamic vinegar to balance the flavors.
Cook for another 2-3 minutes, then taste and adjust the seasoning with salt and pepper as needed.
Serve the sauce warm or cold. Excellent with pasta, grilled meats, or vegetables.
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