1-First Step: Sterilize the jar and prep the spices Start by sterilizing a quart-sized mason jar and letting it dry fully. Any moisture can create problems during storage, so do not rush this part. While the jar dries, measure the fenugreek seeds, nigella seeds, fennel seeds, mustard seeds, chili powder, turmeric, asafetida, salt, and oil so everything is ready. Toast the fenugreek, fennel, and nigella seeds in a skillet over medium heat for 3 to 5 minutes. Stir often so they do not scorch. Once fragrant, cool them down and grind them with the asafetida into a rough spice mix.

2-Second Step: Prepare the limes Wash and dry the limes very well. This is important because excess water can lead to mold. Cut each lime into quarters or small 1/2-inch pieces. If your limes have thick skin, make the pieces even smaller so the salt and spices can reach the center faster. Place the cut limes in a large bowl. Add the ground spice mix, the cayenne or paprika or Kashmiri chili powder, turmeric, the remaining asafetida if needed for your preferred flavor balance, and the salt. Toss thoroughly so every piece gets coated.

3-Third Step: Heat the oil and bloom the mustard seeds Heat the mustard oil, or another high-temperature oil, in the same skillet. Once hot, add the mustard seeds and let them sputter. This step wakes up their sharp, nutty flavor. Pour the hot oil and mustard seeds over the lime mixture while it is still warm.

4-Fourth Step: Pack, sun-ferment, and turn daily Mix the pickle very well so the oil, spices, and limes are evenly combined. Transfer everything into the dry mason jar and seal it. Place the jar in full sun for 5 to 7 days, for about 6 to 8 hours daily. Turn the jar once each day so the contents move around and cure evenly. If you live in a cooler area, a sunny windowsill works well. The pickle will still develop, though it may need a little longer. Watch for signs of softening and a richer aroma as the days pass.

5-Final Step: Chill and serve After fermentation, refrigerate the pickle. Chilling slows the process and helps preserve the flavor.