Pour each of the fruit juices into separate saucepans. Add 50g (1/4 cup) of sugar to each. Stir and bring to the boil, then simmer on a medium heat until reduced by approximately two-thirds. This takes around 30-50 minutes, depending on the juice.
Add a small blob of food colouring gel to the fruit juices if using. Use green for the apple flavour, red for the orange flavour and yellow for the pineapple flavour. Cherry juice shouldn't need any food colouring.
Stir in until completely mixed, then leave the syrups to cool. They will thicken slightly when cool*.
Spoon the shaved ice into cones, bowls or cups and pour 1-2 tbsp of the syrup of your choice on top of each cone. Serve immediately.
Making the fruit syrups ahead:
*Once you've made and cooled the syrups, you can pour them into seal-able containers and refrigerate if you wish. They should keep for at least two weeks..Nutritional information is approximate, per snow cone, based on using 1/10 of the each syrup per snow cone (the nutritional calculator pulls in nutritional info for all of the juices, then works out an average - so the nutritional info may not be exact for each flavour).