Blood orange tart

Name: Blood orange tart
Ingredients: 200g/7oz sugar, plus extra for dusting; 150ml/5fl oz blood orange juice (about 3 oranges); 2 blood oranges, zest only, finely grated; 1 tsp orange blossom water; 3 free-range eggs, plus 2 yolks, beaten; 100g/3½oz butter, cubed; 175g/6oz plain flour; 100g/3½oz cold unsalted butter, cut into small cubes; 25g/1oz icing sugar; 1 free-range egg yolk; 1 tbsp ice-cold water; 3 blood oranges, peeled, sliced into rounds; 1 tbsp icing sugar; double cream or custard, to serve