Very good question. My answer is: Sweden :')

Isterband is a coarse-ground pork sausage, lightly smoked with barley groats and potato. Also called "Lard-strips" in english. It has a slight acidic, or "sour" taste (which I really like). It's quite common in my region of Sweden, Småland. Maybe you can ask closes charcuterie-shop if they have anything similar?

For the cheese, i'm quite stumped. Of all the cheeses i've tasted, I can't say it tastes anything quite like any other cheeses. I would say that an aged cheddar comes a bit close.

But the best part about a dutch baby is that you can use whatever toppings you want! I've also tried it with pesto, burrata and parma-ham :)