How to Make It
Combine 1/4 cup water and sugar in a small saucepan; bring to a simmer, stirring until sugar dissolves. Remove from heat. Add rosemary; let stand 30 minutes. Strain through a sieve into a bowl; discard solids.
Pour 2 tablespoons pomegranate juice and 1 tablespoon rosemary syrup into 4 Champagne glasses. Top each serving with 1/2 cup Champagne. Serve immediately.