In Paisley, where I come from, my parents and folks of their age always referred to soup as 'thae soup were guid', i.e. those soup were good.
Maybe because of the many ingrediants, I don't really know, but soup was always spoken of as in the plural. Peasbrose, a common meal, was again spoken of as plural, not in this song though ....
Peasebrose again, Maw, peasebrose again,
Ye feed me like a craw, Maw, an' me yer only wean!
Jim McLean