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What are these called where you are?
(i.imgur.com)
From Fife so these are rolls. Roll on sausage, roll on bacon etc. Heard them called different things in different parts of UK.
See I don’t know if it’s a size thing. I think it has to do with accessorizing. If you put a filling in it, or iced it, it’s a bun. But plain it’s just a roll.