Would you fire your assistant for such misconduct?

You hire someone to be your personal assistant. You give them small tasks that do not require much thought or effort. In return they are paid 25k a year, and have weekends off, health benefits, etc.

Day one, you send them to get you a salad. Before you go you tell them, I like tomatos on my salad. Do not bring me a salad without tomatos. When they return they’ve brought you a very nice Caesar salad, with no tomatos.

Is that enough to fire someone? Do you think that this sort of detail orientation is something you’d want to train that person to be able to handle?

I see a lot of personal assistant culture centering around getting things like this right. Is this sort of failure the essence of what it is to be an assistant, or is the bigger set of tasks that they have to deal with more important than such bloopers as forgetting the boss likes their coffee with whole milk, not half and half.

Maybe a temporary trial period would be appropriate for such jobs, to see if its a good fit.