Wash the tomatoes and dice them. Wash the jalapeños, remove the seeds if you prefer a milder flavor, and mince them finely. Peel and mince the garlic and red onion.
Heat the olive oil in a medium saucepan over medium heat. Add the red onion and sauté until translucent, about 3-4 minutes.
Add the garlic and minced jalapeños and sauté for another 2-3 minutes, until fragrant.
Add the diced tomatoes, sugar, balsamic vinegar, salt, and pepper. Stir well to combine, then reduce heat to low and simmer for 15-20 minutes, or until the tomatoes have softened and the sauce has thickened slightly.
For a smoother sauce, use an immersion blender to blend until smooth. Let it cool slightly, then serve with pasta, grilled meats, or roasted vegetables.
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