Tamarind grows in trees as a soft, dark brown colored pod with black colored seeds encased inside it. Aiva Tamarind block is seedless, with no colors, no preservatives added, and non-GMO. Tamarind comes in sweet and sour varieties, sweet tamarind is mostly used in Asian cooking. Tamarind is a rich source of vitamins, fiber, potassium, magnesium, and other nutrients necessary for good health. Tamarind blocks can be stored at room temperature for several weeks if stored in an airtight container. Country of Origin: India