Indigenous Australians used the swollen taproot of Boab seedlings as a vegetable.
In recent years this has become more widely recognised, and commercially grown.
https://www.abc.net.au/tv/pohskitchen/stories/s3345483.htmBaby boab roots are the tap root of the tree when it’s just a seedling. The roots grow like a carrot, and the texture of the tuber is similar to water chestnuts.
They are crisp and white, with a sweet delicate flavour. They are best served raw, or lightly cooked, and can be used in salads, stir-fry and soups, or julienned for dips.
Boab leaves are also edible; they have a nutty flavour and can be used in salads, soups and stir-fries, or as a garnish. Poh used them in her boab pickle.
http://www.ausbushfoods.com/bushfoodsonline/news/Boab.htm