Eliot and I collected a bunch of Sumac and made Sumac Lemonade out of it. It was really good!
It would make great Popsicles, too.
10-12 heads of Sumac berries, either Staghorn (we used) or Smooth variety with RED berries. The white are poisonous.
2-3 quarts of water.
Let soak for 20 minutes in cool water. Do not rinse first or you will loose all of the flavor. I had read somewhere of people soaking them for a lot longer, I might try that next time to taste the difference.
Strain through cheese cloth to remove any fibers or bugs.
Sweeten to taste.
Enjoy over ice.