In a bowl mix together 1 cup crushed biscuit, 1 cup desiccated coconut and 1 tsp lemon rind. Mix well.
In sauce pan heat 100 gm butter, add 1 tin condensed milk and mix well.
Mix both the mixtures and put in a tin, chill for 15 minutes till firm.
Method for Icing
Mix together 1 cup castor sugar, 1 tbsp butter, 2 tbsp lemon juice and 1 tbsp water. Spread in tin on the biscuit base.
Spread some desiccated coconut on top and serve chilled.