Arrowroot is a type of herb extract, used for its starchy qualities. Unlike cornflour, arrowroot creates a clear, glossy thick consistency without requiring much heat. It can be used in anything from Chinese sweet & sour sauce, soups, homemade ice-cream and fruit syrups.
Many other thickeners (such as flour) can alter the flavour of the mixture. Arrowroot is popular because it has no flavour of its own, so you can add it to desserts without changing the flavour. Arrowroot is also able to thicken at a lower temperature and is less likely to form lumps.