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I just heard this colloquial sentence on YouTube:
Mais je suis sûr que je peux lui rendre le sourire si je l’emmène manger un parfait arc-en-ciel, t'en fais pas !
You cannot eat a "rainbow" to begin with. The possibility of "poisson arc-en-ciel" occurred to me, too, but there is no particular mention of any fish, either.
Then I wonder... Could it be about eating various fruits and vegetables of different colours as diverse as those of a rainbow?
Given the comment thread, it seems safe to offer this reparsing, owed entirely to Greg:
un parfait « arc-en-ciel » → un parfait couleur arc-en-ciel
There are various dishes called a « parfait », but the dessert glacé (also see more detailed English version) seems like the most likely one.
Searching for « parfait arc-en-ciel » suggests that the rainbow could be achieved either by dye or by using something like your fruit hypothesis to constitute the « parfum » of the parfait.
