Wash the apple thoroughly, peel it, and slice it thinly.
Soak the sliced apple in cold water to prevent browning.
Add 250ml of water and sugar to a pot and boil to make syrup.
Once the syrup has cooled, place it in a bowl with the apples and chill.
Put ice in a bowl, pour the syrup-soaked apples and syrup over the ice to finish.