Mix the flour, salt, egg yolk and water, then knead in the butter and sugar. Wrap the dough in cling film and place in the refrigerator for about 30 minutes.
In the meantime, butter a tart pan and sprinkle with breadcrumbs or flour. Now preheat the oven to 180 ° C fan-assisted air. Roll out the dough, press it into the mold and prick several times with a fork. Bake for 20-30 minutes.
Cream:
Put the milk with the grated lemon zest in a saucepan and bring to the boil. Mix the egg yolks with sugar and flour, add to the milk and heat for about 2 minutes, do not boil anymore! Finally add the squeezed lemon juice and let cool a little while stirring occasionally.
Take the bottom out of the oven, let it cool for 10 minutes and pour in the cream.