Wash, pit, and finely chop the plums. Peel and finely chop the red onion and garlic. Peel and grate the ginger. Finely zest the orange, taking care to avoid the white pith.
In a large saucepan, heat the apple cider vinegar and orange juice over medium heat. Add the brown sugar and stir until completely dissolved.
Add the red onion, garlic, grated ginger, and plums. Stir to combine, then season with ground cinnamon, salt, and pepper.
Bring the mixture to a simmer, then reduce heat and cook for about 30-40 minutes, stirring occasionally, until the plums are completely softened and the chutney has thickened.
Once the chutney has thickened, stir in the orange zest, and cook for another 5 minutes to allow the flavors to meld.
Remove from heat, let cool, and then transfer to clean jars. Store in the refrigerator for up to a week. Serve with cheeses, roasted meats, or on toast.
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