A sidecar is brandy, triple sec, and lemon juice - sort of a weird snooty cousin to the margarita, and certainly not as popular these days. It's not really clear where and how the cocktail originated, but one version has it that it was a favorite of a US Army Captain in Paris during WWI, and named for the motorcycle sidecar he was driven to and from the bar in. Who knows....
Meyer lemons, which are kind of like a hybrid of oranges and lemons, make a sidecar just a bit more fun. They can be kind of hard to find, and they don't last very long in the refrigerator, so take advantage of them whenever you can.
Squeeze and strain your Meyer lemon (they're quite seedy and pulpy), and shake one part juice very well with one part Cointreau and two parts brandy. (I was out of brandy, so I used this pretty nice cognac someone gave me a few years ago.) Serve it straight up in chilled stemware with a sugar rim.
A fine cocktail - one of my personal favorites. Not too tart, not too sweet, and the hint of orange is really nice. I don't remember where I originally found this recipe - probably on some food blog here or there - but I'm glad I did.