A spelt/dinkel bread roll with Mett and shallots. What else do you need?
I've never seen mett on a pizza. Not to say that place doesn't exist somewhere, but it's definitely not common.
If you're ever in Germany again, searching for a decent pizza, don't look for a blinking "Pizza" sign, which usually marks a fast food pizza delivery. Look out for a "Ristorante" or "Pizzeria" which is a real italian restaurant selling authentic italian pizza.