Take a bowl and add jaggery and tamarind.
Add black salt, salt, roasted cumin powder and dry mint leaves.
Over the top, add boiling water.
Try to mash the tamarind and jaggery with fork. If jaggery is hard, no issues, leave it.
Put a lid on the bowl and let the ingredients remain soaked for 2 hours minimum to overnight, maximum.
NOTE : If soaking for 2 hours, then shelf is ok but if soaking overnight, better to put the bowl (on water coming to room temperature) in refrigerator.
After 2 hours, mash the pulp with hands to abstract maximum juice out.
Strain the liquid through a fine masher.
Add lemon juice and mix.
Jaggery and tamarind syrup is ready. Now let's serve.
Take a serving glass having ice cubes and pour 2-3 tbsp of syrup in it.
Top with chilled water.
Enjoy