My recipe for oatmeal: take water, raisins, and nuts if I have them, nuts, bring to a boil, then turn off the heat and let cool. Irish oats are awesome this way done overnight. Do it in a crockpot with a large amount and you'll eat for a week (peas porridge hot, peas porridge cold, peas porridge in the pot, nine days old). I'm hungry in the morning. Easy and a little bit sweet works well.

I've only ever seen that rhyme as "pease pudding hot, ...". Pease, AIUI, is mixed legumes.

https://en.m.wikipedia.org/wiki/Pease_pudding

This is literally the first time I’ve heard the rhyme as “pudding”... it’s always been “pease porridge hot,” in our family for at least five generations now.

Deep fried battered oatmeal sausages (white puddings) are pretty common in Scotland.

https://en.wikipedia.org/wiki/White_pudding