This is my family recipe. The custard is very thick and the chocolate layer on top is much more dense and crackly(if that can be a word).
2 Squares semi sweet chocolate melted
2 Tbsp white sugar
1 Tsp vanilla
2 Cups chocolate wafer crumbs
1 Cup unsweetened coconut shredded
1/2 Cup chopped walnuts
Mix together chocolate, butter, sugar, vanilla, and egg. Once smooth add wafer crumbs, coconut, and walnuts until combined. Press into greased 8X8 pan and refrigerate 30 min.
2 Tbsp custard powder
3 Tbsp milk
1/4 Cup butter
2 Cups icing sugar (add more if it seems to thin for your liking)
Mix until combined and creamy, pour over base and set in refrigerator for 30 min.
6 Squares semi sweet chocolate
3 Tbsp butter
Melt in a double boiler and pour over filling. Chill in refrigerator for 30 min before slicing.