Just before we left for the convention, we had half of a giant watermelon to use up. I cut off the rind and put it through the blender, then Rz helped me pour it into popsicle molds. I'm happy for him to have a treat without all kinds of sugar and other additives.
Next time, I think we will blend the watermelon with some ripe banana or strawberries or something, as the watery part and the pulpy part separated somewhat as the popsicles froze. Rz doesn't seem to mind though!