In Reply to: We stayed in a villa recently in Ubud posted by TnT on Saturday, 23. April 2011 at 09:49 Bali Time:
... if a staff member does more than his or her normal duties.
I don't know the situation at your villa, but if the chef had to purchase the essentials and then cook a special meal, his time at least, and maybe his petrol, should have been compensated in addition to his normal wage. A reasonable amount would be Rp30-50.000.