Sumac has a tart lemon taste and is frequently used in Greek food, according to About.com. Sumac is available as a dried, ground spice that has a deep red color, and it is sold in its original berry form.
Greek food usually employs sumac as a flavoring for meats. Fresh sumac berries can be soaked and drained to extract a red juice, according to Mother Earth Living magazine, which recommends sumac juice as a substitute for individuals who suffer from citrus allergies. Sumac berries also contain antioxidants and malic acid, which acts as an anti-fungal agent, according to the magazine.