Wash the gooseberries. Wipe them with a clean cloth and leave them on the kitchen counter till there is no water/moisture.
On medium heat, toast fenugreek seeds, cumin seeds and mustard seeds. Constantly mix so that they don't get burnt. When the fenugreek seeds change colour and the mustard seeds start crackling, remove from heat. Transfer to a mixie jar and let them cool.
Once the seeds cool, grind them to a fine powder.
Add 3 tablespoons of Red chilli Powder to this powder OR add 5-8 Kashmiri Red Chillies and grind it all together.
Slit the gooseberries along their natural lines.
Heat oil in a pan. On medium heat, fry the gooseberries. When they feel slightly tender. Insert a fort/knife and check. It should go in without pressing too hard. It shouldn't go in very easily either). Remove the gooseberries into a mixing bowl.
You can either let the gooseberries stay as they are OR separate the pieces with the help of the slits that you had cut before frying them.
In the same oil, fry garlic and dry red chillies. Add asafoetida and turmeric powder. Turn off the heat.
Transfer this fried mix along with the oil to the mixing bowl in which you have the fried gooseberries.
Add the roasted powder.
Add salt and mix well.
Transfer to a clean and dry glass jar. Cover and rest at room temperature for a day. In a day, all the spices will render their favour, and the juices from the gooseberries will get released, and the pickle will be ready for consumption.