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In a large saucepan over medium heat, combine the diced mango, red onion, grated ginger, and minced garlic. Cook for about 5-7 minutes, stirring occasionally, until the onions soften.
Stir in the brown sugar and apple cider vinegar. Continue to cook for another 5 minutes, allowing the sugar to dissolve completely.
Add the cumin seeds, cinnamon powder, salt, and chili flakes. Mix well and let the chutney simmer for about 15-20 minutes, stirring frequently until it thickens to your desired consistency.
Once thickened, remove the chutney from heat and allow it to cool to room temperature. Garnish with freshly chopped cilantro before serving.