Wash raw mangoes and then wipe them properly with a cloth. Remove the seed and slice into medium size pieces . In a big bowl add mango pieces salt and turmeric and mix well. Keep covered for 2 days and mix once in a day. After adding salt mango pieces release some water so collect that water in a separate container. Now spread the mango pieces on a cloth or in a big plate. Keep the mango pieces and the bowl in which we have collected the water in sunlight. Keep both (water and mango pieces) in the sun for 2 days. Dry roast fenugreek seeds and crush to make a coarse powder. Lightly crush or pound mustard seeds and fennel seeds.