Transfer them to a serving platter, pour Ginger-Tamarind sauce over them, and serve immediately. GINGER-TAMARIND SAUCE: Put tamarind residue in a nonmetallic bowl, add half cup boiling water, and let soak for 30 minutes. Mash the residue and extract as much tamarind essence as possible, squeezing it hard, into a bowl. Discard the fibrous residue. Put tamarind water in a nonmetallic pan along with cornstarch, mix well and bring to a boil. Cook for 2 minutes. Turn off heat and stir in ginger shreds. Note: For a hotter flavor, stir 4 chopped hot green chilies into sauce.