Makes about 20 slices.

185g (6 oz) butter, softened
4 tablespoons caster suger
4 tablespoons cocoa powder
2 egg yolks
15 plain biscuits, crumbled

1. Place butter and suger in a mixing bowl and beat until light and fluffy. Stir in cocoa, egg yolks and crumbled biscuits.

2. Brush a length of foil lightly with oil. Using a spatula, scrape biscuit mixture onto foil, spreading it out to form a rough log shape. Roll the foil over top and mould to a even log.

3. Refrigerate for 2 hours or until firm. Cut into 5mm (*in) slices. If needed, coat the log with crushed walnuts.

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