I actually can’t decide what it is, if we’re being honest. A gratin is kind of a creamy baked thing, so I’m starting there. But, this also kind of can be treated like queso, so then it would be an appetizer?
This is modeled after a French casserole my parents used to make: whole leeks wrapped in thin ham and covered with white sauce and somehow potatoes were involved too? I don’t remember it very well, I was six. I mainly remember that I really liked the ham but that cutting the leeks was hard, which is still true today – whole leeks are kind of a card that need to be dealt with. Their flavor is great, but they can get a little stringy if you don’t cut them nicely, ya know?
So we slice them into little half moons and cover them in cheese and garlic and ham and call it a gratin.