Can I use frozen rhubarb to make rhubarb syrup?

Yes! Frozen rhubarb works great in this recipe. I recommend thawing the rhubarb in a colander set over a bowl to collect any juices. Measure the juices and add any additional water to reach the required amount for the recipe.

How do I make rhababerschorle?

To make a rhubarb spritzer (rhababerschorle in German), pour rhubarb syrup into a glass and top with sparkling water or soda water. Add ice if you like. I use plain sparkling water, but this would also be great with lemon sparkling water. Make sure it is not sweetened. You can add as much or as little syrup as you like for your spritzer.