There is even a history record (and movies about it) that in World War I the three armies in the thrench stopped their fighting on christmas, made a truce and bascially celebrated christmas together. Exchanging food, singing together, playing soccer and so on. Afterwards these soldiers had to be changed out because they did not want to fight the other sides anymore.
And recently with the Ukraine you have countless of videos of soldiers and the common people that are having fun while the war is going on. A young person playing the piano while the warning bells go off. Soldiers playing music to other people. Even a soldier doing a silly dance because he and his friends got Pizza to eat.
So I agree with you Valkyrie, this makes perfectly sense, especially since the Final days did not even start at that point.
And about the burgers themselves (From Wikipedia)
As versions of the meal have been served for over a century, its origin remains ambiguous.The popular book The Art of Cookery Made Plain and Easy by Hannah Glasse included a recipe in 1758 as "Hamburgh sausage", which suggested to serve it "roasted with toasted bread under it". A similar snack was also popular in Hamburg by the name "Rundstück warm" ("bread roll warm") in 1869 or earlier, and supposedly eaten by many emigrants on their way to America, but may have contained roasted beefsteak rather than Frikadeller. Hamburg steak is reported to have been served between two pieces of bread on the Hamburg America Line, which began operations in 1847. Each of these may mark the invention of the Hamburger, and explain the name.
Hamburgers are typically sold at fast-food restaurants, diners, and specialty and high-end restaurants. There are many international and regional variations of hamburgers.
I marked the high-end restaurant because these are not just sold at McDonalds.