1 grapefruit, juice only
1 lemon, juice only
500g/1lb 2oz rhubarb, cut into batons
40g/1½ oz caster sugar
100²µ/3½´Ç³ú icing sugar
1 star anise
6 stem ginger balls, finely chopped (keep some syrup from the jar to decorate)
250g/9oz ginger biscuits, plus 4 crushed to serve
150g/5½oz unsalted butter, melted
600g/1lb 5oz cream cheese
250ml/9fl oz double cream