Most German Dishes are robust, hearty and direct. If there is hot it will mostly come from horse radish, mustard, garlic or from hot paprika.
Remember, these people are beer drinkers and appreciate everything that goes with those beers.
Like these:
Pepper salami. They do one covered with garlic too.
The street food staple Curry Wurst is pretty hot too.
Usually mustard comes in mild and hot, and “scharf” means hot.
Steak is sometimes served with grated horseradish and an egg yolk
The not very politically correct name Zigäuner Art (Gypsy Style) usually means that the dish, often a Schnitzel, is served with a hot pepper mix.