Interview states to bring an item to sell in a 3 min presentation

Hello,

I applied to a catering position this week, for which I am qualified with at least two years of experience as a waitress, and another job as a museum assistant which gave me great customer service skills. The good news : I got an interview in a week or so.

I was not really nervous until I received an email stating that the interview requires me to give a 3 minutes presentation about any item I want to sell. Now I took a look at all the techniques for the ” sell me a pen” question, but when I read the email I get this impression that I will not get to interact with the person, and so it will be hard to ask for their needs and listen as everybody advises.

Moreover I don’t really understand why a catering position requires a sales technique?

I hope someone understands the interview’s purpose, as I am a bit confused.
For now I thought about a wrist watch since keeping time is a positive behaviour that can be linked to the job.

Best