Caramelised orange tart

Name: Caramelised orange tart
Ingredients: 225 g (8oz) plain flour; A pinch of salt; 2 tbsp. golden icing sugar; 125 g (4oz) butter, diced; 1 medium egg yolk, beaten; Juice of 1 lemon; Juice of 1 orange; Grated zest of 2 oranges; 75 g (3oz) butter; 225 g (8oz) golden granulated sugar; 3 medium eggs, beaten; 75 g (3oz) ground almonds; 2 tbsp. orange liquear; A few drops of orange food colouring (optional); 100 g (3½oz) golden caster sugar to sprinkle; Pared zest of 1 orange, cut into slivers