Recipes Gentiana Be the first to rate & review! The Gentiana's mix of citrus juices and tonic water makes it taste like lemonade for grown-ups. Slideshow: More Terrific Mocktails By Vincenzo Marianella Updated on March 27, 2015 Print Rate It Share Share Tweet Pin Email Yield: 1 drink Ingredients Ice 3 ounces chilled tonic water 1 ounce fresh grapefruit juice 1 ounce fresh orange juice 1/2 ounce fresh lemon juice 3/4 ounce elderflower syrup 1 orange wedge and 1 mint sprig, for garnish Directions Fill a chilled wineglass with ice. Add the tonic water, citrus juices and elderflower syrup and stir well. Garnish with the orange wedge and mint sprig. Rate it Print