Actually, unsure if that is entirely true.
In Iran there is also "Yalda celebrations" (mid-winter solstice), always celebrated on the eve of 21 December, since ancient, pre-Zoroastrian era, and even now. It is the longest night of the year in the northern hemisphere - older FR post
A typical Yalda spread or table
We did celebrate here with family & friends last night. But since I live in Australia, seasons are reversed. So, it is the longest day here - it's an enchanting tradition.
The traditional Christmas Watermelon? Kool....
Thanks for the ping.
It is very commendable that Iranians increasingly celebrate their ancient pre-islamic Aryan festivals.