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.