Tamarind paste is a puree of the fruit without the seeds and fibers. If you’re using tamarind concentrate, dissolve it in 1 tablespoon hot water. If you have thicker scallions, slice them in half lengthwise before cutting into pieces. Tamarind paste is a puree of the fruit without the seeds and fibers. You may also find tamarind concentrate, in which case you'll want to dissolve it in 1 tablespoon of hot water first. If you have thicker, large scallions, slice them in half lengthwise before cutting into pieces.