Wash the green mangoes thoroughly, peel them, and cut them 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 and chili flakes.
In a small saucepan, heat the sunflower oil. Add the thinly sliced garlic and grated ginger. Fry over low heat until golden brown.
Add the mango, salt, and vinegar to the spiced oil, and mix well.
Cook over low heat for 5 minutes, or until the mango softens slightly and the flavors meld together.
Transfer the prepared achar to a clean, sealable glass jar and let it 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 be.
Serve with rice, Indian breads, or grilled dishes.
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