This has indeed been a fascinating topic. Who knew there could be so many different ways and definitions for processing oats? Who knew how they would effect baking? I agree with Jane that most of the recipes I ran across are likely modern adaptations of a traditional idea. I don't fault them for that, it's just not what I'm looking for. Especially when my recipe is a flop, lol. I was actually okay with the honey because they did make mead, although foods eaten were largely dictated by social class.
What started this was my summer project of cooking the cuisine of my ancestors. I've been exploring a variety of cultural groups, partly because of an interest in genealogy and history, but also to learn how they combined the foods available to them and how they prepared and preserved them. I am learning a lot!
For example, I found a scholarly paper by a Russian linguist who analyzed all the Old English words for bread, its ingredients, and its influence on Anglo-Saxon culture. (
The Domain of Bread in the Anglo-Saxon Culture.) One tidbit I learned is that Old English has words for both unleavened and leavened bread, and I found a description of how they made leavened bread.
For me, this all ties back to permaculture under the concept of traditional off-grid skills as part of permanent culture. In other words, learning to do things without having to buy something. Having the Permies community to ask about things like porridge oats is an excellent resource. I love the conversation and I'm learning a lot.