This tamarind is not sour like the Mexican variety. The fruit of Thai Tamarind can be eaten plain and uncooked as a sweet treat.
In Thailand, a cultivar has been bred specifically to be eaten as a fresh fruit: it is particularly sweet and minimally sour. It is also sometimes eaten preserved in sugar with chili as a sweet-and-spicy candy. A tamarind-based sweet-and-sour is can be made with this fruit as well as many other delicious dishes and desserts.