Tamarind paste is a thick, sticky paste made by boiling tamarind pulp with water and straining off the seeds and fibers. It has a concentrated, sour tamarind flavor and a slightly chunky texture. Tamarind concentrate is made by evaporating water from tamarind pulp to make a thick, syrupy liquid. It is even more concentrated and sour than the paste. It has a smooth, syrupy consistency.