Prepare the ingredients: slice the jalapeño peppers, removing the seeds if you prefer a milder sauce. Finely chop the garlic and red onion.
In a medium saucepan, heat the sesame oil over medium heat. Once the oil is hot, add the chopped garlic and red onion, and sauté until translucent.
Add the sliced jalapeño peppers to the saucepan and sauté for 2-3 minutes to release their flavors.
Pour in the red wine, then add the brown sugar, balsamic vinegar, salt, and pepper. Stir well to dissolve the sugar completely.
Bring the sauce to a simmer, then reduce the heat and cook over low heat for 15-20 minutes, or until the sauce has thickened. Stir occasionally to prevent sticking.
Once the sauce has reached the desired consistency, remove it from the heat and let it cool slightly. Then, using an immersion blender, purée the sauce until smooth, if you prefer a more homogeneous texture.
Pour the finished sauce into a clean jar and seal it tightly. Store in the refrigerator for up to a week.
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