- Dry roast the fenugreek seeds and powder them coarsely with a mortar and pestle. Heat the oil in a wide bottomed pan, add the mustard seeds and let them splutter. Reduce heat and add the Asafoetida, raw mangoes, red chilli powder and salt. Toss in the powdered fenugreek and mix well. Add the vinegar and give it another toss. Let it cool down completely and transfer to an airtight jar. Serve with rice.