2 ounces Sauvignon Blanc or other crisp white wine
1 ounce vodka, preferably Cîroc
1/2 ounce St-Germain elderflower liqueur or elderflower syrup
1/4 ounce crème de cassis (black-currant liqueur)
1 lemon twist, for garnish
Fill a pint glass with ice. Add all of the remaining ingredients except the garnish and stir well. Strain into a chilled martini glass. Pinch the lemon twist over the drink, rub it around the rim of the glass, then drop it into the drink.