A problem addressed by means of intuition, such as a recipe (for coconut cake) in which the ingredients and amounts used are unclear.
"HARVARD PROFESSOR Roland Fryer has made a discovery with the potential to transform public education. To understand it, though, it helps to first hear a story about the conundrum of the coconut cake.
Fryer’s grandmother makes an astounding coconut cake, a magical confection of sweetness and air he’s loved since he was a kid growing up in Florida. Fryer wanted to learn to make the cake himself, but every time he pressed for a recipe, she gave him directions like “use a good amount of sugar, a little flour but not too much, and just a bit of baking powder.”--Gareth Cook, Education's Coconut Cake Problem