Another lovely summer sipper. While I really enjoy a "traditional" cosmo with vodka, I like the added complexity provided by the rum in this variation.
Being big rum drinkers, I think this is our favourite Cosmopolitan. The sweetness will depend on the rum you used. It has a nice balance and not overly sweet. For us, liking more sour cocktails, I think we will use just slightly less Cointreau. This is a keeper.