I'm mostly recording this on the basis of its name, which emerged spontaneously from what I had at hand.
3/4 oz bourbon (mmmmm, Buffalo Trace)
3/4 oz añejo tequila
3/4 oz aged rum (I used Pusser's, which has both a fascinating history and a wonderful funk)
1/2 oz rich ginger syrup (use Turbinado or other natural sugar, with a sugar-to-water ratio of about 1.5:1)
Juice of 1/2 lime
Pour over ice in a Collins glass, stir well, and fill with soda water.
I love long drinks. Amazingly, this remains refreshing despite the cold weather where I live. The result is something like a deep and complex Long Island Iced Tea. Alternate name: the Panama Canal Iced Tea.