Coriander hidden

Owl: It never works to ask Vlad the Bear to buy some food on his way home. He disappears for hours and never brings all the items. Especially if you ask him to buy coriander. He has never brought it! Not once! And he keeps telling me that somebody has hidden it in the store so he hasn't managed to find it! Can you believe it?

Author: Actually I have two different keys to this mystery. Either Vlad the Bear doesn't know what 'coriander' is... or there is a real conspiracy of the hidden coriander!