What is this fruit called?

The pomelo, shaddock, or in scientific terms 'Citrus maxima', is the largest citrus fruit. It is a natural, i.e., non-hybrid, citrus fruit, similar in appearance to a large grapefruit, native to South and Southeast Asia.

It’s shaped like a teardrop and has green or yellow flesh and a thick, pale rind. It can grow to the size of a cantaloupe or larger. Pomelo tastes similar to grapefruit, but it’s sweeter.

After a Captain Shaddock of an East India Company ship introduced it to Barbados, the fruit was called "shaddock" in English. From there the name spread to Jamaica in 1696. It remains a common name for the fruit among English authors.

Pomelo leaves are used for aromatic baths. The essential oil can be extracted from the leaves, peel or seeds of some pomelo species. Oil from the seeds of an inferior pomelo species was used to light opium pipes in Indochina.