First pour the flour on your worktop and use the bowl to make a well in the middle. Then fill the well with the egg yolk, the buckwheat flour, the liquid, the olive oil, the sugar and the salt. Now mix it to bring everything together and then knead it into a beautiful dough. Then wrap it in foil and let it rest in your fridge for at least 1 hour. After that dust some flour on your worktop and roll out the dough into a thin sheet. Place the dough on the tartelette mold and gently press it in the mold. Then place the top molds on top and cut the dough with the cutter. Then place another tray on top and bake them at 150 degrees Celsius for around 40 minutes till golden brown. Once golden let them first cool down a bit and then when still lukewarm grate the top with a grater or a fine microplane.