Emperor Norton Cosmopolitans

I accidentally developed a recipe for grey Cosmopolitans, which I've named in honor of my grey cat, Norton, and San Francisco (home of the original Cosmopolitan cocktail)'s folk hero (see more on him here): 

Shake over ice:

• One part fresh-squeezed lime juice
• Four parts tangerine-zest-infused vodka (make this yourself by dumping a bunch of tangerine zest in a bottle of vodka and letting it rest for a few weeks)
• Half a part unsweetened cranberry juice concentrate
• One part blue curacao (instead of the traditional triple sec)

Strain into martini glass. Sugared rim optional. Why gild the lily?

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