In a small saucepan, simmer the pomegranate juice and sugar, stirring frequently, until the liquid thickens and reduces by about half, about 8-10 minutes. The syrup is done when it's the consistency of honey. Move the pot off the heat and let cool.
In a shaker, combine 1 oz of the pomegranate syrup with tequila, apple cider, Cointreau, and lime juice. Fill with ice and shake until cold. Pour into your favorite spooky cocktail glass and top with sparkling water or sparkling cider. Garnish with a rosemary sprig. Terrify your friends with your mad bartending skills. OooOOOOoooOh.
Keyword apple cider, cocktails, drinks, fall, halloween, margarita, pomegranate, tequila