Granita is pretty simple to make although you need to be by your freezer to stir the mixture every twenty minutes to ensure that the mixture does not freeze into a solid block. A good task for young kids!
For coffee or lemon granita
250g/9oz freshly squeezed lemon juice or espresso coffee
120g/4oz sugar
100g/3½oz water
For the granita, place the lemon or espresso, sugar and water into a pan over a medium heat and stir to combine and dissolve the sugar.
Remove from the heat and pass through a sieve into a large deep-sided tray.
Place the tray into the freezer. At 20 minute intervals, stir the mixture with a fork until the granita is set.
Eat on a warm and sunny day! I think these are numbered in the UK :(