Recipe For Disaster Dwarf. Location of rohak, under white wolf mountain. Go to falador, and talk to kaylee in the rising sun inn next to the west bank.
The subquests range in difficulty from easy to very hard. He will eventually tell you the recipe for a price of 100gp, but only once he is completely drunk. Recipe for disaster is the 100th quest released by jagex, being a sequel to the cook's assistant quest.
Go to the passage under white wolf mountain and talk to the old dwarf (rohak) there.
Head to the tunnel under white wolf mountain (cave north of taverley lodestone). Now return to an old dwarf, now called rohak, and give him all four beers in a row. Go to falador, and talk to kaylee in the rising sun inn next to the west bank. Use 4 asgoldian ales on him and then, after the fade, quickly use another on him.