Juice 2 lemons and 2 limes. You should have a total of 3/4 cup of juice – 6 ounces/180ml
To a blender, add sugar, juice, salt and 8 ice cubes. Blend and add a little cold water if your blender needs help.
Add remaining 8 ice cubes and blend, adding as little cold water as possible. Taste and add more sugar or ice/water according to your taste and the tartness of lemons/limes.