Years ago I was getting shots at a bar. Each shot had three different kinds of liquor, which would settle in layers. The idea was that while each liquor didn’t taste great on its own, the whole shot would taste really good, like chocolate cake or something.
A friend said it’s called “chocolate cake”, but googling on that got me a very different recipe. Most of those have only two liquors and involve sugar and lemon. That’s not what we had.