• 300 g cold water
  • 700 g caster sugar
  • 4 limes (juice and zest)
  • 20 g basil (or about 1 sprig, crushed and chopped)
  • tiny, tiny pinch of kali namak


  • To make the cordial, put the water and sugar into a deep bottomed pan and gently heat over a medium flame to dissolve the sugar.
  • Take off the heat allow to cool slightly until tepid.
  • Add the lime juice, zest and basil.
  • Allow to cool entirely, then, strain through a sieve.
  • Add the slightest amount of Kali Namak, I’d say maybe about a fifth of a teaspoon
  • Note: Too much and it’ll smell of rotten eggs, too little and it’s not worth it. Get it just right and it’s amazing what a tingly flavour sensation it adds.
  • Mix the cordial with soda water. 1 part cordial to 4 or 5 parts water, depending on your personal preference.
  • Serve chilled. Garnish with a sprig of fresh basil and enjoy!!