1) You can also use freshly grated coconut.
2) You can add more water if u don't like thick chutney.
3) You can also add lemon juice instead of tamarind pulp to build on sourness.
4) Furthermore, you can add red chilies as a replacement for green chilies.
Soak the tamarind pods in water for 20 to 25 minutes and squeeze up the pulp.