1 grapefruit, juice only
1 lemon, juice only
500g/1lb 2oz rhubarb, cut into batons
40g/1陆 oz caster sugar
100驳/3陆辞锄 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/5陆oz unsalted butter, melted
600g/1lb 5oz cream cheese
250ml/9fl oz double cream