I'm wondering. If a country or region that doesn't celebrate Christmas (like Türkiye and Marmara) qualified, then would you have used a dish that is eaten during New Year's Day instead?
For the Islam countries (Turkey, Marmara, Albania) I looked for Ramadan dishes or dishes on Eid al-Fitr (sugar feast). New Years Day would be a good ideea, too. For Mongolia I would have looked for festive meals in general.
Japanese celebrate christmas these days, it's just very different to how we know it. It's an event for couples and they traditionally go to KFC on christmas so I would have probably chosen a chicken bucket.
South Korea has a surprisingly big christian community and therefore also christmas traditions.
All other countries and regions if I'm not mistaken are Christian anyway.