I’m from the UK and my partner is from the States. Every year she has the kids leave milk and cookies out for Santa, which I find odd because we left out sherry and a mince pie in my house. At the same time, we live in Scandinavia and I’m sure the Christmas gnome (julenissen) is unhappy about the lack of porridge.
Oat/havre is for breakfast, rice/ris is for kids sour cream/rømme is the old ways for the grown ups, preferably with “salt pinn” flat bread and saltet and cured sheep or pig leg.