Note from Ricardo Tamarind concentrate is harder to find than the paste. Tamarind paste is available in most Asian grocery stores, as well as some supermarkets. To make your own tamarind concentrate, bring ½ cup (125 ml) water to a boil. Remove from the heat. Add 2 oz (55 g) tamarind paste and let soak for 10 minutes. Using a fork, stir to break up the tamarind. Strain through a sieve. This will yield 1/3 cup (75 ml) tamarind concentrate.