Wash, pit, and chop the plums into smaller pieces. Finely chop the red onion and garlic, and grate the ginger.
In a medium-sized saucepan, heat the apple cider vinegar, then add the brown sugar and stir until dissolved.
Add the red onion and garlic and sauté over medium heat until translucent.
Add the plums, grated ginger, and cinnamon stick, then stir well to combine.
Sprinkle in the ground nutmeg, chili flakes, and freshly ground black pepper, then simmer over low heat for 25-30 minutes, or until thickened.
Season with salt, and adjust the taste with extra sugar or vinegar if needed to achieve the perfect sweet and sour balance.
Remove the cinnamon stick, then use an immersion blender to purée the chutney if you prefer a smoother texture.
Let cool, then store in a jar in the refrigerator. Excellent with grilled meats, cheeses, and toast.
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