Pomegranate Spritzer

Fill chilled highball glass halfway with ice. Add 4 ounces unsweetened 100 percent pomegranate juice, ½ ounce simple syrup, and ¼ teaspoon nonalcoholic old-fashioned bitters, and stir to combine using bar spoon. Add 4 ounces chilled seltzer and, using spoon, gently lift pomegranate mixture from bottom of glass to top to combine. Top with additional ice. Garnish with pomegranate seeds and serve.