Prepare the ingredients: mince the garlic, slice the jalapeño peppers (remove the seeds for a milder sauce), and chop the tomatoes into small pieces.
Heat the olive oil in a medium saucepan over medium heat. Add the minced garlic and sauté for 1-2 minutes, until fragrant.
Add the jalapeño peppers and diced tomatoes. Stir to combine, then cook for 5-7 minutes, until the tomatoes begin to break down.
Pour in the balsamic vinegar and sprinkle with brown sugar. Continue to cook over low heat, allowing the flavors to meld, for about 10 minutes.
Season with salt and black pepper to taste. For a smoother sauce, use an immersion blender to purée the sauce.
Let the sauce cool slightly, then serve with roasted meats, grilled vegetables, or sandwiches. Store in the refrigerator for up to a week.
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