There are only two languages spoken in the Netherlands, Dutch and Fries (Fries is only an official language in the province of Friesland). Today, there isn't a part of the Netherlands where German is being spoken. And to my knowlegde there has never been. (I think the construction of those last sentences is way of, but it's understandable, right?)

So I would guess the person who gave the recipe only spoke German or maybe if he/she spoke German with your grandmother, he/she just gave the German name and didn't think of giving the name in its original language.

What are scratch and sniff photos?