Heat 1 tbsp oil in a pan on medium flame and gently fry the chillies for 3-4 mins. Remove and set aside
Heat the remaining oil in the same pan and crackle the fenugreek and mustard seeds followed by the hing (asafoetida). Take care not to burn the fenugreek seeds. Toss in the ginger, garlic and curry leaves and sauté for a couple of mins till the garlic is lightly golden.
Now keeping the flame low to medium, add the ground turmeric, chilli and fenugreek . Cook the dry spices for 10-15 seconds and pour in the tamarind pulp. Bring this to a simmer and add the chillies and salt. Cook till the raw taste of tamarind disappears and mixture has thickened to a saucy consistency.
Mix in the jaggery and cook for a couple of minutes more. Check and correct the seasoning if needed, pour in the vinegar, mix well and turn off the heat.
Cool he pickle before bottling. let it sit at room temperature for 2-3 days before eating. This will help the pickle to cure and develop in flavour. Store in a refrigerator.