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Melt the butter, chocolate and golden syrup in a heatproof bowl over a pan of just simmering water, stirring occasionally.
Break the biscuits into pieces into another bowl, then add the marshmallows, pecans and sultanas. Pour in the melted chocolate and gently stir everything together until well-coated. Drop spoonfuls of the mixture onto a baking tray lined with baking parchment, then dust each with some edible gold lustre, if using. Chill for 1 hr before packaging. Will keep in the fridge for up to three days.