70g/2陆oz fresh root ginger, peeled and sliced
2 pink grapefruit, juice and zest only
3 white grapefruit, juice and zest
1 red grapefruit, juice and zest
2 tsp lemon juice
250g/9oz plain flour, plus extra for dusting
60驳/2录辞锄 caster sugar
300驳/10陆辞锄 caster sugar
陆 tsp ground cinnamon
2 tbsp cornflour
3 tsp ground ginger
65驳/2鈪搊锄 icing sugar
陆 tsp salt
pinch salt
125驳/4陆辞锄 butter, chilled and cubed
70g/2陆oz unsalted butter, cubed
1 small free-range egg, beaten
3 large free-range eggs
140g/5oz egg whites, at room temperature
2 large free-range egg yolks
5 large free-range egg yolks