Dry roast pepper corns, cumin seeds, mustard and fenugreek seeds for few seconds, Grind to make a fine powder.
Dice the mangoes. Rremove the seeds.
Add mango pieces into boiling water and cook for 2-3 minutes.
Drain it.
Heat oil in a vessel and add ginger and garlic. Saute for 2-3 minutes in a low flame.
Add boiled mango, powdered pepper masala, turmeric powder and required salt.
Mix well and cook for 10-15 minutes in low flame. Keep sauteing.
Add vinegar and remove from flame.
Let it cool and keep in air tight jar.