This is from Aristophanes' Frogs, written and performed as the plague ravaged citizens of Athens hunkered behind their walls with Spartans terrorizing the Attic countryside.
So to help, Dionysus goes to hell to bring back a good poet to cheer people up. Because imagine trying to get through 2020 without TV.
There's a great line describing Aeschylus' sentences as great galumphing things with adjectives hanging off them like monstrous shaggy eyebrows.
The soup is a metaphor for bringing back a poet from the dead. Pretty obvious, right?
For some reason Dionysus is being coy about what he wants - I'd guess either for some cultural reasons, or just as a premise to set up some jokes about being hungry and horny.