Authentic Kerala Pickle/ Vella naranga achar

Ingredients :

Lemons: 4 large sized (6-8 small ones)
Bird's eye chilli : 10  slit.
Garlic: 4 to 5 cloves and cut to length wise
Ginger: 2 table spoon finely chopped
Curry leaves: 2 to 3 sprigs.
Vinegar: 3 table spoon.
Gingelly oil: 1 1/2 tbsp.

Asafoetida - 1/4 tsp

Fenugreek powder - 1/4 tsp

Mustard seeds - 2tsp
Salt: 2 to 3 tsp or as needed