Heat water in a pan, once it starts boiling, turn off the gas. Add the cauliflower pieces,let it stay in warm water for 10 minutes, remove the cauliflower pieces.
Similarly, add other vegetables and let it stay in hot water for few minutes (5 minutes).Drain the excess water.
Once the excess water has been drained, move the vegetables to a bowl. Add the spices including the powdered mustard seeds.
Transfer the contents to a clean jar
Keep the jar in sunlight or a warm place for 3-4 days (longer in winter).
Lightly shake the vegetables once a day.
The pickle is ready to be consumed when the carrot turns slightly sour. If not sour, keep in the sun for a few more days. It took me 8-10 days during the winter season.
Once ready ,store your vegetable achaar in refrigerator as it has no preservatives.