
Place the sage leaves, lime zest, and simple syrup in a measuring cup with a spout. Use a muddler or the flat end or tip of a wooden spoon to gently press against the ingredients. Turn in each direction to muddle them together.
Divide the sage syrup into four 16-ounce highball glasses. Divide the pomegranate juice and the reserved lime juice into the cups.
When ready to serve, add the club soda and stir gently to combine. Add ice and garnish with pomegranate arils and lime wedges, if desired. Serve immediately.