Wash and wipe the lime, allow to dry, then cut each lemon into 8 equal pieces.
Take a bowl add chopped lemon, 1-2 tsp salt and turmeric, mix it very well, cover it and keep aside in dry a place for 24 hours.
Next day boil 2-3 cup of water into the wide pan. Add soaked lemon in it and bring it to the boil.
Strain the water mixture using sieve and remove all water, spread all lemon on kitchen towel and dry it.
Now heat oil in a pan. Add hing, mustard seeds, fenugreek seeds and fennel in the pan, stir it for 2-3 second on low flame, then add red chili powder, coriander powder and cumin powder, stir it again for few seconds, now add grated jaggery, continue stirring it till melted on low flame.
Take lemon pieces add into the jaggery-masala mixture and add salt as per taste, switch of the flame, mix it properly, allow it to cool down completely, then add into the glass jar and keep aside.
Now last step is to keep lemon pickle long lasting, heat the mustard oil in to the small sauce pan, let it cool down, then pour over the prepared lemon pickle, mix it slowly using spoon, cover the lid and place it into the dry place (kitchen shelves).
Sweet Lemon Pickle or Limbu Nu Athanu is ready to use, serve it with meal as a side or serve it with Mathari or a dry snacks item and enjoy the pickle.