What do people put on Prussian king Frederick the Great's grave?

In culinary terms the Rosti and Kartoffelpuffe both use grated potatoes so perhaps he should be named Frederick the Grater. (Kartoffel is German for potato)

I envision a grave with lots of potatoes growing on it....

Kiwozzie, I think it was the French who got their people to accept potatoes by putting armed guards around the potato patches.