Shake the first three ingredients, pour over ice, top with the mineral water and garnish with a wedge of lime.
Borjomi can be found in European delis. Vichy Catalan or similar flavorful mineral water can be substituted. An ordinary seltzer will take away significant dimension; consider adding a pinch of salt.
Hrenovukha (horseradish vodka) recipe: to 500ml vodka, add 3 inches of grated horseradish root, 3 cardamom pods, 6 whole cloves, a teaspoon grain mustard, and two tablespoons honey. Let infuse for about a week, shaking once a day, then strain through a fine cheesecloth or cotton to remove all solids. The spices are negotiable, but the volume of horseradish is key.