Tried this tonight, but as I recently bought a bottle of Ferrand Dry Curacao used it in place of my Cointreau. As suggested by Werd Bmocsil below, I used a drop of 20% saline as I am not a fan of salted rims. Excellent cocktail, not too sour, not too sweet. I wonder though if I missed out a bit on the orange citrus using the Dry Curacao. This was a very "smooth" cocktail not aggressively sour. I think though I will try next time with out the saline to see if that gives this otherwise excellent cocktail just a bit more punch as well as using Cointreau to see if that ups the orange component.
I think I would use saline solution instead of a salt rim next time. Otherwise, the recipe is a worthy use of any vodka that manages to finagle its way into the cabinet. :-/
Love the different citrus tastes with each sip. The bitterness of the orange comes through with the clean taste of the vodka. This is perfect time to use your mid to upper range vodka in your drinks cabinet. We used Ultra 34 by Purity out of Sweden.
I just tried it with bison grass vodka (my favourite vodka for some time now). It is very much a citrus-forward drink, definitely has a 'clean' taste. I still prefer the brandy/cognac based Sidecar but it's an interesting twist for sour-lovers.