You'll literally argue about anything won't you, I was seeing how many replies I could get out of you over a roll.Yes, that's the origin, but that's still a different usage isn't it. Adjective vs noun. Basic stuff, here.
A single roll is called a Batch in Cov, whereas elsewhere it might be a batch of rolls. Batch in Cov means the roll, elsewhere it means it's baked in a set of other rolls
