John Cusimano's "Spring Forward" Vodka Cocktail

John made this cocktail to go with Rach's Pasta with Peas, Ricotta and Pistachio. It's a vodka-based drink that includes lime, agave, club soda, cucumber, basil and something called St-Germain, which he loves. "It's elderflower liqueur," John explains, "so it's not too sweet and it's a little floral. It's kind of the perfect balance." (Rach says John used it in a margarita once in place of the orange liqueur and now she doesn't want her margaritas any other way!) The drink is light and the perfect match for Rach's cheesy, lemony pasta. "Cheers!" says Rach.