As part of my Russian cooking class series at Common Ground Food Co-op, I developed this gourmet version of the infamous Moscow Mule cocktail. Traditionally made with vodka and ginger beer, this refreshing drink is my go-to cocktail during the hot summer months. Although there's nothing wrong with the traditional recipe (which doesn't have anything to do with Moscow or Russia), I thought the drink could be cleaner. So I invented my own version. The "gourmet" version replaces ginger beer with real ginger juice. The unique "zing" of ginger is what makes mule drinks special and using the real thing makes all the difference. Without ginger beer, there is also no sweetener to balance out the lime juice. So I use agave nectar instead -- it's so much better for you than the corn syrup usually used to sweeten ginger beer. But what about the bubbles, you say? No problem, let's use seltzer water instead.  Now the big question: what kind of vodka s...