1. (Note: can use fresh squeezed pomegranate juice or a commercial brand such as Pom, which is available year-round; orange blossom water should be available in Middle Eastern or Latino markets.) Mix together pomegranate juice, lemon juice, orange blossom water and sugar until sugar dissolves.
2. Pour 5 ounces of mixture into a glass and slowly add 5 ounces (or more to taste) of club soda, stirring slowly.
3. Add several ice cubes to chill, and serve.