Finely chop the red onion, garlic, ginger, and jalapeño peppers (removing the seeds is optional if you prefer a milder sauce).
In a medium saucepan, heat the olive oil over medium heat. Add the red onion and sauté until translucent, about 3-4 minutes.
Add the garlic, ginger, and jalapeño. Sauté for another 2-3 minutes, or until fragrant.
Pour in the tomato puree, then add the apple cider vinegar and brown sugar. Stir well to combine.
Season with salt and freshly ground black pepper, then reduce the heat to low.
Simmer the sauce for 15-20 minutes, or until thickened and the flavors have melded.
Taste and adjust the seasoning, adding more jalapeño or sugar if needed.
Serve the sauce warm or cold with grilled meats, pasta, or grilled vegetables.
Store in an airtight container in the refrigerator for up to 5 days.
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