Sunnier Sour

Right to my taste.
All the ingredients are of my favor. Couldn't go wrong, I guess.
Proportions are a bit quirky, but worth trying it.

4 oz. Club Soda
1 1/2 oz. Grapefruit Juice
1 1/4 oz. Dark Rum
1/2 tsp. Superfine Sugar
1/4 oz. Lemon Juice

Spumoni

In a comic book that I mentioned earlier, it was written that there are some golden combination, that can never go wrong. One of them was grapefruit juice and tonic water.
Well, those two are my own preferred drinks, so why not try the recipe?
The name seems to be more frequently used to refer the italian desserts, but who cares.

Version found on the web:
3/4 Campari
1 part Grapefruit juice
1 part Tonic water

Version on the comic book:
Campari 2
grapefruit Juice 3 -> stir
+ Tonic Water