Remove the salt from the pretzels and cut them into small pieces.
Put the pretzel pieces into a large bowl and add the milk but be careful: Don't add all at once, you might need less, depending on how dry the pretzels are.
Mix the milk and pretzels and let soak for a while.
Meanwhile, cut the onions into small cubes and fry them in some butter.
Check if the pretzels have soaked well, maybe add some more milk if needed. It should have a mushy but not liquid consistency, that still can be shaped.
In a small bowl, scramble the eggs and add the eggs and fried onions to the pretzel bowl.
Mix all well, add salt and pepper as needed (taste some of the mass to season right).
In a large pot, bring lightly salted water to a boil and reduce the heat so it only simmers lightly.
For napkin dumplings: Place a thick string of the mass onto the upper third of a fabric napkin. Roll the napkin around the mass, creating a tight kind of sausage. Close the ends with kitchen twine.For sphere shaped dumplings:Create several spheres, press them tight!
Place the dumplings into the water so they are mostly covered, and let simmer for 20 minutes.
Remove the dumplings from the water and remove the napkin and cut into slices (napkin dumplings only) and serve.