Sauer Milch

[Bob Riebe]

I will say do not use  it except in desperation .
 A.cold salad that calls for vinegar to be added to cream, i.e. cucumber salad, even with my lousy taste buds, it tain't the same but for cooking it works well.

https://www.bonappetit.com/story/sour-milk-tips?utm_source=pocket-newtab

Now sauer milch would work well here:
https://getpocket.com/explore/item/how-to-make-the-best-macaroni-and-cheese-on-the-stove?utm_source=pocket-newtab