Wash mangoes then dry it with kitchen towel, Now cut mangoes in medium size pieces
Take a big size steel/plastic/wodden pot, Put mangoes pieces,salt and turmeric powder n mix very well
Keep it in sunlight so that, juice will come out from mangoes n cheakpeas will suck all juices
Heat oil in kadhai till smoke comes out, Now add hing and switch off gas stove, Let it cool down naturally
Heat a heavy bottom pan on medium heat
Now dry roast fenugreek,fennel and mustard seeds one by one,Don't roast mustard seeds more than 1 minute
Cool it down naturally, Now make fine powder form these spices
Now we will add all dry spices, spice powder and 1/2 cup of oil in it,With help of wooden stafulla mix all spices together properly
Keep this pickle pot in full sunlight for atleast 4-5 days, Stir several times during pickle making process
Now it's time to keeup pickle in glass jar, Put pickle in the jar and add rest of oil in the jar,Tie muslin of cloth on the neck of jar
After a week put jar cap on the bottle,Pickle is ready to serve