There are a few impostors out there that claim to be Long Island Iced Teas. In actuality, there is only one correct way to make a LIIT... and this is it!
Fill a cocktail shaker with ice. Pour vodka, rum, gin, tequila, triple sec, and sour mix over ice; cover and shake. Pour cocktail into a Collins or hurricane glass; top with splash of cola for color. Garnish with a lemon slice.