peel and chop the onion
prepare thick tamarind paste or water
fry the fenugreek seed in the pan without oil until it turn into golden brown
fry the cuminseed in the same pan with out oil until it turn into brown
fry the coriander seed until it get colour change
mix all fenugreek seed, cumin seed and coriander seed and make as a powder by grinding it
in a kadai heat the oil and temper the mustard,little cumin seed and fenugreek seed
add chopped onion and fry it until it turn into golden brown
add tamarind paste and mix well and allow to cook until the onion get cook well for 15 mins
add salt and red chili powder and mix well
allow to cook for 10 mins in medium flame
add that masala powder which we prepared early and mix well
allow to cook until onion get thick consistency as a pickle
now here is the easy and instant onion pickle