I think they're referencing jojo: https://www.youtube.com/watch?v=_2ElkIqJXGE

Though, the jojo character is a nazi and does a nazi salute in the moment.

Hamburger obviously

In English they are called Sub from "submarine sandwich", based on traditional Italian style sandwiches that are the same as Bocatas. That is also where Subway restaurants get their name.

But yes, the issue is that nor in Germany nor England have the "normal" bread, which they call Baguette.

The closest thing I would say for Germans is a Brötchen, which in Spanish would be like a panecillo. What you are seeing in the picture is a Bratwurst Brötchen

It's a pet peeve of mine, alongside calling everything "salami".

Spoken like a true salami.

Test results are in: you are HIV salami.

Relishes aren't really a thing in Germany, so, traditionally you only put mustard on a Bratwurstbrötchen. However, the sausage itself already contains herbs and spices, like a copious amount of marjoram, some pepper, mace, allspice, and sometimes wild garlic, caraway, or ginger.