What are the most essential items for a kitchen?
I've been living with my fiancee for the past six months, and despite no longer living on-campus, she's still fairly set in her college ways. Our apartment for a while looked basically like a big dorm room. I've been trying to get things more transitioned to a more adult setting, which has worked to some extent with recent purchases of furniture that isn't made out of plastic. So I'm starting to look more at our kitchen, which has a very limited selection of tools and generally not a whole lot of ingredients/spices/etc.
So, what I'd like to know is, what do you think is essential to have in a kitchen? It could be tools, seasonings/spices, other general recipe components...anything that you think no kitchen should be without.