Blaspheme all you want – everyone does in SF, and transgressions are easily forgiven during happy hour (4pm to 7pm). Your Search for the Holy Trinity ends with the eponymous cocktail (gin, campari, vermouth), but sins confessed in the glow of decanter chandeliers could end with a Zombie (a blend of rums also referred to as 'death in a glass').
This spot is also notable for its to-go beer, including Pliny the Elder.