Peel the oranges, cut them into small pieces, and remove the seeds.
Heat oil, add mustard and cumin seeds, and saute until fragrant.
Stir in the turmeric, red chilli powder, and hing.
Cook for 15 to 20 minutes, stirring until thickened, after adding the diced oranges.
Mix in sugar, salt, and adjust flavour with dried chillies and vinegar. Simmer until desired consistency. Let it cool, and serve.