Sidecar

The almighty classic. Honestly, you can swap out the spirit for whatever you want....

1 1/2 ounces Brandy (I like a nice cognac)
1 ounce cointreau
1/2 ounce lemon juice

Shake and strain.

This is a classic 3-2-1 ratio. It will really work with whatever you put as the spirit. Vodka, gin, whiskey. Tequila, and replace the lemon with lime and you have a margarita!