Mix the butter with the flour. Add the sugar, egg yolk, and orange zest scraped from one blood orange. Make a homogeneous pastry and put it in the fridge for an hour.
Preheat a fan oven (convection) to 170°C (340°F).
Form into a thick sausage, cut off equal-sized slices, about 1.5 cm thin. Squish them a little flatter and add to a lined baking tray—Bake for about 15 minutes, or until golden brown.
Prepare the Blood Orange and Ricotta Cream:
Put 2 tubs of Ricotta in the freezer for about 30 minutes, so it’s very cold when you make the dessert.
Squeeze 4 oranges, add the juice to a saucepan and add half as much sugar as a liquid. Cook on medium heat until the liquid thickens. Cut two thin slices of orange and add to the syrup for a few minutes. Remove and put on a plate for later.
Take four oranges and peel them using a good knife. You will need to remove all the peel and the zest. Then, fillet the orange pieces from between the skin (takes a bit of patience) and add them to the cooled syrup.
Assemble the Dessert:
Prepare 4 glasses or small bowls and add a few generous spoonfuls of Ricotta. Then spoon equal amounts of blood orange in syrup over and decorate with half a slice of the candied orange. Place the glass bowl on a plate with 2 biscuits by its side. They also taste delicious crumbled over the top.