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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.
While not claiming to be any authority on the bread sciences, I’d say that a roll is roughly the size of just the palm, while a bun is closer to the size of the full hand.
A bun also passes the Burger Test: Could you easily fit a burger on this bread? If yes, it’s a bun; if no, it’s a roll.
*makes notes*