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.