Prepare the ingredients: finely chop the red onion, garlic, and ginger. Rinse the capers under cold water to remove excess salt, then roughly chop.
In a medium saucepan, heat the olive oil over medium heat. Add the chopped red onion and sauté for 3-4 minutes, until translucent.
Add the garlic and ginger to the saucepan and sauté, stirring constantly, for another 1-2 minutes, until fragrant.
Pour in the tomato purée, then add the white wine vinegar, brown sugar, salt, and pepper. Stir all ingredients thoroughly to combine.
Add the chopped capers, then reduce the heat to low and simmer the sauce for 20 minutes, stirring occasionally, to allow the flavors to meld.
Taste the sauce and adjust the seasoning with more salt, sugar, or vinegar if needed. For a smoother consistency, blend the sauce using an immersion blender.
Let the sauce cool, then transfer to a clean, airtight jar. Store in the refrigerator for up to one week.
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