Heat the water to 80°C and pour it over the tea leaves in a pot. Allow the tea to infuse as recommended on the tea package, then sift the tea to remove the tea leaves. Allow the tea to cool completely in the refrigerator. Add Hermesetas Liquid or Hermesetas Granulated to taste. Cut the lemon into slices and place the slices in the pot. Serve over ice cubes and garnish with lemon slices.