I went to Wales a couple of months ago and brought back a tin of Welsh Laverbread. Laverbread isn’t bread, but it is sloppy seaweed. I never actually found it in Wales, in fact Welsh food was disappointingly British. Nevertheless, laverbread is meant to be traditional Welsh food.
You can’t easily get it here in Sydney, but you can get a similar effect by getting Japanese nori sheets, soaking in a bit of water (to rehydrate it and to remove the salt). Potentially can add some ground oats to it, and then cook it in bacon fat, serve with eggs, with bacon on bread.