Wash the tomatoes and chop them into small pieces. Peel and finely chop the red onion, garlic, and ginger.
In a medium saucepan, heat the apple cider vinegar and brown sugar over medium heat until the sugar is completely dissolved.
Add the chopped onion, garlic, and ginger and sauté for a few minutes until softened and translucent.
Add the chopped tomatoes and stir well to combine.
Stir in the chili flakes, ground cinnamon, mustard seeds, salt, and black pepper. Mix thoroughly to ensure the flavors are well incorporated.
Simmer the chutney over medium heat for about 40 minutes, stirring occasionally, until it thickens and reaches a jam-like consistency.
If you find it's too thick, add a little water and cook for another 5 minutes.
Once ready, pour into clean jars and let cool. Store in the refrigerator for up to 2 weeks.
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