Ah, I know what you're talking about. Those would actually be two mararons glued together with a filling. You see, the shell is just a bit crisp and the inside is soft, so it would be impossible to split an individual cookie.
You should give them a try. Despite what people say, they're not that difficult to make. To perfect, well, that's another story. But I'm a perfectionist. ;)
Here's the best link I've found about macarons