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Place the mango in a large bowl. Mix in the salt, chilli powder, asafoetida and ground fenugreek.
Heat the oil in a frying pan. Add the mustard seeds and as they begin to pop, add the curry leaves and dried chillies. Fry over a medium heat for 1 minute, then pour the contents of the pan over the mango. Mix well and set aside to cool.
When cool, transfer to a screw top jar and store in the refrigerator for up to 1 month. Leave the pickle to mature for at least one week before use.
posted by Mr Falafel