At my mom's, the dumplings were allowed to get cold, then they were fried in a pan with butter shell, a few "clattered" (whisked) poured over them, briefly whipped, and then a fresh green salad was served.
For my part, I have always chosen this variant: I also seared the dumplings, and I made a sour two-sauce sauce with it. PS: Steam the finely chopped onions until translucent, deglaze with a little cream, season with salt, pepper and a dash of vinegar, done.
That was always on the menu at Kahlgrund, simple, inexpensive, and above all it tasted good.