The pomelo ( pom-il-oh, pum-),citrus maxima, is the largest citrus fruit from the family rutaceae and the principal ancestor of the grapefruit. it is a natural, non-hybrid, citrus fruit, native to southeast asia. similar in taste to a sweet grapefruit, the pomelo is commonly consumed and used for festive occasions throughout southeast asia. as for the grapefruit, phytochemicals in the pomelo have the potential for drug interactions.

Source: Wikipedia