Add the sugar and 400ml (13½fl oz/1½ cups + 1 tbsp) water to a small saucepan and place over a low-medium heat for 5 minutes, or until the sugar has dissolved. Increase the heat to medium and simmer for 5 minutes. Remove from the heat and allow to cool slightly.
Pour the sugar syrup into a Creami tub and stir through the lemon juice. Cover and transfer to the f