Wash, pit, and roughly chop the plums. This will help the sauce cook faster.
Finely chop the red onion, garlic, and fresh chili peppers. Remove the seeds from the chili peppers if you prefer a milder flavor.
In a medium saucepan, heat the olive oil over medium heat. Sauté the red onion until translucent. Add the garlic and chili peppers, and sauté for another 1-2 minutes.
Add the plums, brown sugar, cinnamon stick, apple cider vinegar, and water to the saucepan. Stir well to combine, then bring to a simmer.
Reduce the heat to low, and simmer the sauce for 30-40 minutes, or until the plums are softened and the sauce has thickened. Stir occasionally to prevent sticking.
Remove the cinnamon stick. Use an immersion blender to purée the sauce until smooth. For an even smoother texture, strain the sauce through a fine-mesh sieve.
Let the sauce cool completely, then transfer to sterilized jars. Store in the refrigerator for up to a week.
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