Wash the green mangoes thoroughly, peel them, and dice into small cubes.
In a dry skillet, toast the mustard seeds, coriander seeds, and cumin seeds until fragrant, about 1-2 minutes.
Crush the toasted spices in a mortar and pestle, then mix with the turmeric powder.
In a small saucepan, heat the sunflower oil. Add the thinly sliced garlic and grated ginger. Sauté over low heat until golden brown.
Add the mangoes, salt, vinegar, and honey to the spiced oil. Stir well to combine.
Simmer over low heat for 5 minutes, or until the mangoes soften slightly and the flavors meld together.
Transfer the finished achar to a clean, airtight jar. Let cool to room temperature.
Refrigerate for at least 24 hours to allow the flavors to fully develop. The longer it sits, the more intense the flavor will become.
Serve with rice, Indian breads, or grilled dishes.
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