All's Well That Ends Well
So, for the first time in ages, you discovered that the better part of a quart of whole milk in the fridge had gone sour. You, personally, hadn't bought any whole milk in many a year, but ever since Himself took up making ice cream, it's been showing up more and more. But there it was, a whole lot of sour milk.
So you looked around and found the treasured Sour Milk Cake recipe and discovered that you lacked an ingredient. A day or so went by and you managed to get what you needed. And, so, it was time to get started and you got out the biggest bowl.
You combined the sugar, powder, soda, cocoa and flour (noting that you must put flour on The List); you melted the butter and beat the eggs and added the vanilla to that mess. You made the well in the center of the dry ingredients and . . .
. . . went into the fridge for the sour milk.
What sour milk? It wasn't there! It's hard to overlook a quart of milk (sour or otherwise), even in the most crowded of refrigerators.
Himself passed through and noted your puzzlement. You explained. "Oh, I threw that out," he reported. "It was sour."
He continued, "But I think I read somewhere that you can MAKE sour milk if you need it."
You went back into the fridge for the lemon juice . . . .