Take a portion of the mixture and squeeze it in your fist. Put the dough ball on a baking tray and give it a slightly conical shape. Spread the balls on the tray, keeping them fairly well apart.
With a pastry brush brush a little of the egg yolk into the centre of each biscuit. It doesn’t matter if the yolk runs down the side of the biscuit, as it will still look attractive.
Bake in an oven preheated to 180C for around 20 minutes. The biscuits will spread slightly and will be a faint yellow colour when cooked. When you take them out of the oven, check that the bottom of the biscuits is an attractive gold. If not, cook them for another 3 to 4 minutes, but don’t allow the biscuits to brown or they will be too hard.