Limoncello Martini Makes 2 servings. Ice 3 ounces vodka (6 tablespoons) 1 ounce limoncello (2 tablespoons) 1 teaspoon simple syrup (see note) Lemon twists Fill a shaker with ice. Add vodka, limoncello and simple syrup. Shake well and strain into oversized martini glasses. Garnish each with a lemon twist. NOTE: Simple syrup is made by combining 2 parts granulated sugar with 1 part water. Simmer, stirring, over low heat until sugar is dissolved. Chill before using.