The recipe for the drink that we have been calling a “Dirty Charlemagne” at Scholar HQ is:
2 oz Gin
1 oz Chambord
Yes, it is a Gin and Tonic with some Chambord splashed in. Any drink named after Charlemagne needs to have some Chambord in it, even though it was Louis XIV that made it the Liqueur Royale.
I think we Scholars can come up with an improved Dirty Charlemagne formula for this modern day and age (with 100% less mercury), but it would take some doing and some of you might want a drink you can call a Dirty Charlemagne with our blessing before we figure out something suitably strange that doesn’t taste awful.