Start by trimming off any excess stems from the roots.
Wash the khus roots 5 to 6 times to remove dirt, debris or impurities.
Take water, khus roots, sugar and citric acid in a pan.
Put it on a boil for 15-20 mins.
Let the water turn sticky. No need of any string consistency.
Off the pan from the heat and let it cool completely.
Remove the khus roots by squeezing them so that there remains no syrup in them.
Sieve the syrup through a fine sieve lined with clean kitchen towel or muslin cloth.
Add green food colour and mix. Khus Syrup is ready. NOTE : Store bought khus syrup comes in green colour which is obtained from green food colour. You can skip the colour addition which will make the drink yellow.
For serving, take a serving glass and add 2-3 tbsp of khus syrup.
Pour chilled water or milk. Add ice cubes if you want.
Enjoy.