Sumac Berries grow on a bush and the berries turn bright red in the fall. The Sumac used in culinary applications is grown in the Middle East and is the Rhus coriaria species. It should not be confused with its similar looking, but poisonous North American relative. Ground Sumac imparts a sourness to dishes. It is often used in Middle Eastern dishes in the ways that lemon or vinegar would be used by Western cooks.
There is no preparation needed for ground sumac.