1 tsp caster sugar
1 tbsp caster sugar
75g/2½oz plain white flour
1 tsp icing sugar
¼ tsp vanilla extract
75g/2½oz plain, dark chocolate, broken into pieces
100g/3½oz white chocolate, broken into pieces
50g/1¾oz butter, cut into cubes
350ml/12fl oz double cream
250ml/9fl oz double cream
2 medium free-range eggs, beaten