Buttermilk lemon pie

Ingredients

• 250 gram flour
• 80 gram sugar
• pinch of salt
• 100 gram butter on room temperature
• 1 egg yolk
• 2 tablespoons cold water
• 350 gram sugar
• 2 tablespoons all-purpose flour
• 250 ml buttermilk
• 4 eggs
• 4 egg yolks
• 2 tablespoons vanilla extract
• 100 gram melted butter
• 1 lemon (juice + zest)