Reverse-engineered from
The Edison, something i just relatively successfully made myself. Strangely, the flavors really do hold together.
1 low-ball or rocks glass, filled with ice.
2 parts (Fill halfway with) good gin (not over-flavored like Sapphire; regular Bombay or Tanqueray are good choices)
1/2 part Kahlua or coffee liqueur, 1/2 part vanilla Schnapps or syrup (it's alcoholic enough as it is)
1 part tonic.
Stir.
Garnish with lime if you're that cool.
Strangely delicious. They call it a "Spot Weld" there, and I see what they're getting at. This should make it far and wide.