Wash the tomatoes and bell pepper, then chop them into smaller pieces.
Finely chop the onion and garlic.
Heat the olive oil in a saucepan over medium heat. Sauté the onion until translucent.
Add the garlic and bell pepper and cook for 5-7 minutes, or until the bell pepper softens.
Add the tomatoes and simmer over low heat for 10-15 minutes, or until all the ingredients are tender and the flavors have melded.
Season with salt, pepper, and a pinch of sugar. Use an immersion blender to purée the sauce until smooth.
Stir in the chopped fresh basil and cook for another 1-2 minutes.
Serve the sauce warm with pasta, meat, or vegetables. It can be stored in the refrigerator for 2-3 days; gently reheat before serving.
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