That said, I altered the recipe here a bit to try to get it a little more lemony and a little less flowery. It was mostly successful, but I still think the better the tonic water/bitter lemon, the better. Maybe I'll even try making my own tonic water one of these days, if I can get a hold of some cinchona bark powder...
Anyway, on to the drink:
Lemon Rum CoolerThis drink fares a bit better, as the flavors of the rum and falernum are quite a bit stronger than the gin and vermouth. The extra lemon juice here makes a bit of difference, as the original drink only called for 1/2 oz. It's definitely got the potential to be more refreshing than the Bitter Lemon Cooler, but still, it's not as crisp as I'd expect it to be. Maybe I've just got irrational expectations of the bitter lemon soda. I dunno...
3/4 oz lemon juice
2 oz light rum
1/4 oz overproof rum (bump it up to 1/2 oz if you're daring!)
2 oz pineapple juice
1/4 oz falernum
Shake all ingredients with ice, strain into a tall glass, top up with bitter lemon soda.