Yes, it is fun. But I'll bet there's more to the story of steak tartare. Here's a find! You can see the sandwiches I described at the right: https://en.wikipedia.org/wiki/Steak_tartare#:~:text=It%20was%20formerly%20made%20of,a%20dimple%20in%20the%20middle. Duesseldorf is very near the Dutch border; that's probably where the custom comes from. Along with mayo on your French fries.