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Grease an 18x28cm shallow tin.
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To prepare base: combine butter, sugar
and cocoa in a pan.
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Stir over low heat until melted and
well blended.
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Stir in egg and vanilla.
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Cook, stirring, 1 minutes, remove from
heat.
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Combine biscuit crumbs, coconut and
walnuts in a large bowl.
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Pour in butter mixture and mix well.
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Press into prepared tin and
refrigerate until set.
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To prepare filling: cream butter, sift
icing sugar and custard powder together.
-
Add to butter alternately with hot
water.
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Beat until fluffy.
-
Spread over base and refrigerate until
set.
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To prepare topping: melt butter in a
pan over low heat.
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Add chocolate, stir to combine while
melting.
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Pour over custard topping.
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Refrigerate until set, cut into
fingers to serve.
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Keep refrigerated.