Take a pan. Fill water into it(around 3 glasses). Put lemongrass (chop lemongrass with kitchen scissors) into it.
Boil it around 5 minutes. Now add jaggery. Stir continuously till jaggery melts. Switch off the flame. Cool & strain it in a jar.
Make juice of ginger. Add juice into lemongrass & jaggery mix. Now add juice of 1 lemon. Put rock salt. Give a stir.
Place this in fridge for around 3-4 hours. Serve chilled. Your herbal Breezer is ready. Enjoy.