Pick the sumac around August in order to make sure it is ripe. Ripe sumac has a dark velvet color. Also ensure that you don’t pick the Sumac cones immediately after rain since it tends to wash away the flavor.
With your hands, remove the small Sumac berries from the stems and place them in a container filled with fresh cold water. You’d want about 1 cup of water for each cone.
Crush the berries with your hands for a couple of minutes, or you could alternatively put the mixture into a blender and let it blend away.
Let rest for about 30-60 minutes depending on how strong of a flavor you want.
Strain using a cheesecloth, and sweeten to your liking. Serve cold with ice.
Do not boil the Sumac cones, as that can produce a bitter taste. However and alternatively, soaking the Sumac cones in hot water can yield to a nice healthy tea.