So you want some Fool's Stout, eh? Thinking of heading back to the races...?
All right, bring me more of Zanzil's mixture and I'll make some more stout for you.
Fool's Stout has a 2 hour duration. If you don't get back to the gnomes at the raceway in time, it evaporates. This quest allows you to get more of it in case you weren't able to turn it in when you got it the first time.