I can't take credit for the Rhubarb & Rosewater Syrup
because it's the creation of Heidi at 101 Cookbooks. Her recipe is perfect as is, so I'm sending you there for it. I made a half recipe of the syrup and used 2-ounce shot glasses as popsicle molds for 10 popsicles. Consider the volume of liquid you'll need before you begin. If you're using larger molds, you can easily double (or more) this recipe.