The great replies above remind me of an incident in our local friendship circle. People in my valley bring contributions to get-together lunches or dinners. Could be a salad, fancy-prepared potatoes, homemade bread, handpicked berries, ice cream, a bottle of wine, whatever.
One time a good friend of my wife (call her “Lois”) brought brownies to contribute to dessert. She didn’t mention it but, being short on spare time, she’d bought them at a local bakery. When we’d all finished with the delectable dinner, the brownies plate was passed around.
The most worldly woman at the table, a transplant from the big city and normally a bit narcissistic, looks wide-eyed at Lois and blurts out “This is the most delicious brownie I’ve ever tasted!” To which Lois smiled and quietly replied, “A secret Jewish recipe, handed down through my family.”
Lois revealed only to my wife where the brownies had come from. (So far as I know, my wife only revealed the secret to me.)