01 -
Mix together flour, powdered sugar, and salt in a large bowl. Use your fingertips to work in the cold butter until the mixture feels crumbly. Add the egg yolk and cold water, then knead it quickly into a dough. Shape it into a ball, wrap it up, and refrigerate for half an hour.
02 -
Heat the oven to 180°C. Roll out the dough and press it into a greased tart pan. Poke the bottom with a fork, line with baking paper, and add weights. Bake for 15 minutes, then another 5 minutes without weights to lightly brown it.
03 -
Whisk eggs, sugar, zest, and lemon juice in a pot. Cook over low heat, stirring constantly, until it thickens (takes 5-7 minutes). Remove from heat and stir in the butter.
04 -
Pour the lemon filling onto the cooled crust and smooth it out. Chill for at least 2 hours in the fridge.