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.

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