Take crushed digestive biscuits(if you are using digestive biscuits, add a pinch of salt)/ Cookies in a bowl, add butter and mix well.

Take a crystal serving dish, spread the mixture on it, flatten it with your palm and keep it in freezer for 30 minutes.

Take a separate bowl, put guava puree (deseeded before making puree) in it, add thick cream and mix it well with spatula.

Boil 1/4 cup of water and mix it in a bowl of gelatin. Stir well, make sure it dissolved well without forming any lumps.

Add molten gelatin in a guava cream mixture and mix thoroughly.

Take out a dish of set digestive biscuits from freezer.. put a layer of guava mixture and keep again in refrigerator for 1 hour.

Garnish it with sliced pistachios before serving..