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Nous ne ménageons pas nos efforts pour fournir à nos clients les fruits et les légumes les plus frais qui soient.
I wonder if you add « qui soit/soient » to the superlative only when you are boasting of its quality. If so, I imagine that it wouldn’t make sense to use this expression with an adjective with a negative connotation, as in « le plus mauvais qui soit ».
Qui soi(ent) = that exist, existing in the world, qui exist(ent).
Un peu comme l'usage de "ever" en Anglais, on a un renforcement du sens:
It's the worst book. It's the worst book ever.
Je lui donne les plus beaux légumes.
Je lui donne les plus beaux légumes qui soient.
On a en plus du renforcement de sens, une certaine amélioration "esthétique" de la phrase. Elle est un peu plus littéraire que si on avait ajouté "du monde", ou autre.
It would be grammatically correct, but the sentence would have an unusual meaning: why would they get the worst possible produce?
Instead, you can say
Ils vendent les légumes les plus mauvais qui soient.
"qui soit" / "qui soient" = "that exist(s)"
It's basically the same usage as "ever". The full phrase corresponding to "ever" would be something like "that has/have ever existed", like:
They are selling the worst vegetables that have ever been grown.
In French, the full phrase would be "qui aient jamais existé", such as:
Ils vendent les pires légumes qui aient jamais existé.
Note that "jamais" is usually translated by "never" when talking about a frequency, but this is also the right way to translate "ever".
