TIL The first oranges weren’t orange. The original oranges from Southeast Asia were a tangerine-pomelo hybrid, and they were actually green. In fact, oranges in warmer regions, such as Vietnam and Thailand, still stay green through maturity.

https://htschool.hindustantimes.com/editorsdesk/knowledge-vine/did-you-know-that-the-first-oranges-werent-actually-orange

https://www.reddit.com/r/todayilearned/comments/15jirdj/til_the_first_oranges_werent_orange_the_original/