Wash the green chiles and then wipe them well with a cloth napkin.
Remove the steams and then chop chilies into roundals.
Heat oil in a heavy bottom pan.
Then add mustard and fennel seeds in the medium hot oil.
When seeds start crackling add asafoetida and the crushed coriander seeds and peppercorns
Then add turmeric and chopped green chilies.
Stir fry for few seconds and add salt and mix well.
Cover and cook for approx 2-3 minutes on low heat or till they soften a bit
Now open the lid and add coriander powder,mango powder and sugar.
Stir fry for a minute on low heat.then remove from the flame.
Refrigerate when cool down completely.
Serve along with poori,paratha or daal-rice.