Another tip when making noodles you use extra flour to keep noodles separated, I just add any extra flour along with noodles to help thicken broth. (neighborfoodblog.com)
Gently whisk the onion thickened broth into the hot cream. (remonline.com)
You must include the potatoes, however, as they not only thicken the broth, but soak up all of that gorgeous red beet color too! (jjbegonia.com)