.5oz Gin
.5oz White Rum
.5oz Silver Tequila
.5oz Cointreau
.75oz Lemon Juice
2tsp Simple Syrup
.75oz Mexican Coke
Shake ingredients (except the Coke), then strain into a Highball or Collins glass over ice. Top with Coke and a lemon twist.
Next time I'd probably double everything, this is a Long Island Iced Tea after all, use a bit less lemon juice and garnish with a lemon wedge instead of a twist.