Mix the pomegranate juice with the sugar and lemon juice in a saucepan until the sugar has dissolved.
Bring the juice to the boil briefly and then turn the heat directly to medium.
Simmer the pomegranate juice for approx. 80 - 90 minutes until a syrup is formed.
Allow the syrup to cool and pour into a sterile container. The syrup will keep in the refrigerator for at least 4 weeks.
Note: It is important that you are in the last quarter of an hour and check how your syrup is doing. The last few minutes are critical. Every cooker heats slightly differently, so it may take a little longer or a little shorter. Shorter is not a problem - but if the syrup boils down too long, it will turn into caramel (you probably don't want that). If you want to make less than 1.5 litres of juice into syrup, make sure you shorten the time!