Place ingredients into a medium-sized saucepan. Place over a gentle heat; continually stirring until the mixture starts to simmer and thicken. Pour into a medium-sized bowl and using an electric mixer, blend for 40 seconds. Leave to cool to room temperature (30 minutes), then cover and place in the refrigerator; 4 hours, preferably overnight.
Remove from refrigerator and whip to form a light and airy consistency by using electric beater or whisk.
Add sugar and essence to ProZero whipping cream which has just been prepared (above). Stir in colouring (if using). Taste and add more sugar if required.
Pour mixture into a large freezer proof container and place in the freezer for 1 hour.
Remove from freezer; using a fork or wire whisk, quickly beat to break up any ice crystals. Return ice cream to freezer for further 3 hours (minimum). Serve cold.
Serve with permitted fruit.
ProZero ice cream is easy to make in an ice cream maker; simply pour mixture into your machine after finishing step 1 above. Then, following manufacturer’s instructions; churn until the ice cream is thick and frozen. Enjoy straight away or transfer to a suitable container and freeze until needed.
*ProZero is a food for special medical purposes and must be used under medical supervision.