SS asked if i had a recipe so i said id post the one i have but i have never made it so can't comment on taste but here it is
INGREDIENTS
25 limes cut into wedges
1 cup of salt
50g 1/4 cup fenugreek powder
50g 1/4 cup mustard powder
150g chili powder
1 tbsp ground turmeric
600ml mustard oil
1 tsp asafoetida
25g yellow mustard seeds crushed
Place the limes in a large sterilized jar or bowl add the salt and toss together with the limes, cover and place in a warm place for 1 to 2 weeks until they become soft and dull brown in colour.
When limes areready mix together the fenugreek, mustard, chili and turmeric together and add to the limes cover and leave to rest in a warm place for a further 2-3 days.
After that heat the oil fry the asafoetida and mustard seeds. when the oil reaches smoking point pour over limes and mix well, cover and leavein a warmplace for a week before serving.
hope it taste good