A recipe for a spinach casserole / gratin calls for topping it off with Appenzeller before putting it in the oven. I cannot find Appenzeller in the store.
https://en.wikipedia.org/wiki/Appenzeller_cheese distinguishes between classic, surchoix, and extra Appenzeller, but the recipe doesn't give that much detail; it just says Appenzeller.
What cheese would you recommend instead?