Peel and cut Keri in pieces not too small.
Heat Oil and add Coriander,Fennel,Cumin,Mustard,Nigella And Fenugreek seeds.
Roast whole spices on low for a minute till aromatic
Add cut raw Mango pieces, Salt and sauté on medium for about 2 minutes.
Add 1 cup Water, Turmeric, Kashmiri chilli powder, Pepper, Cinnamon, Cardamom powder, Garam masala and Black salt.
Cook covered on low~medium for 2 to 3 minutes till soft.
Add Jaggery, mix and cook till it melts.Check consistency which should be neither too thin or thick.
Refrigerator and store in an air tight glass container for about a month.