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Directions Preparation:15min › Extra time:1hour chilling › Ready in:1hour15min
Crush biscuits roughly then put in a bowl. Melt the margarine, sugar and cocoa together. Add the sherry or rum. Stir in the biscuits then spoon in to a flat tin and smooth down with the back of a spoon.
Refrigerate until firm then cut into slices with a warm knife.
You can add 1 raw egg to make it richer, if you like.