1 punnet blackberries
2 tbsp lemon juice
¼ tsp ground allspice
½ tsp ground cardamom
225g/8oz caster sugar
1 tbsp caster sugar
¼ tsp ground cinnamon
2 tbsp icing sugar
¼ tsp ground mace
225g/8oz self-raising flour
225g/8oz butter, softened
4 free-range eggs
250ml/9fl oz double or whipping cream