Whey separated from yogurt or kefir can be used with egg and olive oil to make a fermented mayo. It’s delicious.
So much better than any store bought processed crap 

 Dude I have to try this. Can you send a recipe?
I have so much whey right now 

 Just sent it. Wife makes it in the Blendtec. You have to pour the oil in really slow because mayo is an emulsion. 

 I don’t seem to have a dm from you, checked both panes. 

 It’s in a regular reply