1 orange, finely grated zest
8 passion fruit, halved and pulp removed
175g/6oz plain flour, plus extra for dusting
75驳/2戮辞锄 caster sugar
30g/1oz icing sugar
icing sugar, for dusting
100g/3陆oz cold butter, diced
150ml/5fl oz double cream
1 free-range egg
4 large free-range eggs
single cream, to serve
1 large orange, juice only (or 50ml/2fl oz orange juice)