This must be the most classic Saturday lunch for Norwegians. And it makes itself. You only have to boil rice and add milk. Then leave it in the oven for an hour at low heat. If you come to Norway, you will find commercials for this everywhere. Often related to trolls and fairytale stories.  I hear stories of leaving the pot with porridge in their bed, with the comforter covering the pot. That would take several hours, and were the older days when a stove oven wasn’t a part of every home.