Sure, there are two possible coherent responses that would be consistent with modelling the thinking of an ancient stoic philosopher, depending on your modelling philosophy:

1) Actually model their knowledge boundaries (modulo the language of interaction) -> "What is ethylene glycol?"

2) Assume for the purposes of making this fantasy interaction more useful, a more modern knowledge base -> "One should obviously not serve ethylene glycol, it is a toxin".

"Pair it with ocean foods" is just the dipshit word generator approach -- "Get advice from a stoic philosopher if he had just been hit in the head with a boat oar".