1. Mix 50ml of hot water with 1 tsp of brown sugar.
  2. Stir until the sugar has dissolved.
  3. Fill your glass to the top with ice.
  4. Squeeze the juice from a whole calamansi lime, and add.
  5. Add 50ml Scotch whisky and stir.
  6. Garnish with a slice of calamansi lime.