2 ounces brandy
1 ounce Cointreau
1/2 ounce lemon juice
Shake with ice. Strain into a cocktail glass.
Often, this drink will be served in a sugared rimmed glass. Unless the glass is properly prepared ahead of time, this will often result in sticky fingers, so I personally prefer to forego the sugared rim.

The Sidecar is a classic cocktail which most bartenders know, but seems to be rarely ordered. Part of this is because it is poorly made, and more often than not made with sour mix instead of fresh ingredients. Properly made this drink should be made with cognac (or brandy), Cointreau, and fresh lemon juice. There are however a variety of ways these ingredients can be combined, the secret is how to do so in a way that presents a perfect balance.