Thai

First, make the sauce. Take the tamarind pulp (a block about 1 x 2 in (2.5 x 5 cm) and mix it with ½ cup boiling water (you can add a little more if needed to dissolve the paste). Break up the pulp in the hot water, and then press the mixture through a fine-meshed strainer. Discard the solids. To the liquid tamarind concentrate you just made, add the sugar, fish sauce, Thai black soy sauce, Thai sweet soy sauce (if using), and white pepper. Set aside.