To begin making kadha, add hot water in a pan.
Crush ginger, cloves, black peppercorns,carromseeds, fenugreekseeds in a mortar and pestle.

Add all the crushed ginger ingredients along with tulsi leaves to the pan. Cook on medium heat for about 20 minutes or till the decoction is reduced to half.

Strain the mixture in glass and drizzle few drops of lime if you want. Serve it hot.