this is one of the most annoying part of the quest... what you need to do is after you talked to dave, you have to talk to her mother, and she will tell you that all the rats ate the spices... now, get your cat (not overgrown one, cuz it cant catch rats, nor a kitten because you will be there for hours), and tell the cat to chase-a-lot-of-vermins. the cat will kill the rat, and they will drop 4 different colored spices. you have to get the amount of each spice right in the stew to save dave. Trick is, firstly just add 1 dose of 1 spice, and talk to dave, he will tell you how many spices are right. If you get it right, record it, and move on to the next spice. etc. there are 4 to get right. Once you got all of them, make another stew with all the right spices in right amounts, and talk to dave again, he will try and eat it, and you will stop him. Tele back to lummy and you are done.