tamarind powder

The tamarind tree is native to Asia and Africa, but it also grows in tropical climates around the world. It produces pods of fruit that taste sweet and sour when ripe and even more sour when unripe or dried.

India and Thailand produce the most tamarind, and it holds a prominent place in their cooking. But it's a staple ingredient in other Asian cuisines, too. You'll also find it in African and Middle Eastern cooking.