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First, make some shavings from the bar of chocolate by dragging a large knife over the surface. You only need a little – enough to top the sundaes. Set the shavings aside and break the remaining chocolate into a saucepan. Add the remaining sauce ingredients and heat gently, stirring, until the chocolate melts and you have a smooth glossy sauce.
Crumble the cake or pudding into sundae glasses and drizzle over the alcohol or pear juice. Top with the pear quarters and ice cream. Drizzle over the chocolate sauce and top with the hazelnuts and chocolate shavings.