What on God's earth is a pea fritter, whether (v) or not?

By the way, Scots don't speak the same language as the rest of us.
"Two fish suppers and a can of juice please".
Apparently, "X supper" translates to "X and chips", while "juice" means "unspecified soft drink".

In your universe, does a chip buttie need to have butter, marge, lard, mayo or similar, or is it OK with just bread and chips