Feronia elephantum.

Botanical name: 

Feronia elephantum Correa. Rutaceae. Elephant Apple. Wood Apple.

East Indies. The fruit is of the size of a large apple and is covered with a hard, gray, scabrous, woody rind. The pulp is universally eaten on the coast of Coromandel. The interior of the fruit, says Firminger, is filled with a brown, soft, mealy substance, rather acid and smelling of rancid butter. Brandis says a jelly is made of it in India, and Wight says that this very pleasant jelly resembles black-currant jelly. Dutt says it is cultivated in India for its fruit, the pulp of which is eaten and made into a chatni.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.