At the office shindig, nothing apart from the ill-chosen top is more revealing than your drink order. David Wondrich, a cocktail guru and author of Imbibe!, whips up the must-have drink of the season.
Shake well with ice:
1 oz gin
1/2 oz St. Germain Elderflower Liqueur
2 tsp. fresh-squeezed lemon juice
2 dashes Angostura bitters
Strain into a chilled cocktail glass and top with cold brut champagne. Garnish with a long lemon-peel spiral.