Shake all ingredients with ice and fine strain into a chilled Martini glass. Garnish with lemon or orange twist.
A fragrant, easy to love variation on the classic martini! The bracing, dry flavors of gin and the sweet, floral-fruity flavors of elderflower liqueur balance each other beautifully. Play with the proportions of St. Germain and dry vermouth according to personal preference. I like a good dose of vermouth, but some may prefer to substitute a dry white wine.