Prepare the Mangoes – Wash, dry, and chop raw mangoes. Mix with 1 tbsp salt and let sit for 4-5 hours.
Sun-Dry the Mangoes – Squeeze excess water, spread on a cloth, and sun-dry for 1-2 days.
Prepare the Spice Mix – Combine salt, turmeric, red chilli powder, fenugreek, fennel, mustard, coriander, nigella seeds, and asafoetida.
Mix with Mango Pieces – Coat sun-dried mango pieces with the spice mix.
Store in a Jar – Transfer to a sterilized jar, pressing down gently.
Add Mustard Oil – Heat mustard oil to smoking point, cool, and pour over mangoes until submerged.
Sun-Dry the Pickle – Keep the jar in sunlight for 4-5 days, shaking it daily.
Store and Enjoy – Seal tightly and store in a cool, dry place. The pickle is ready in a week and deepens in flavor over time.