01 -
In a bowl, mix flour and powdered sugar. Cut in cold butter until crumbly. Add egg yolk and just enough cold water to form a dough. Wrap and chill for 30 minutes. Roll out and cut circles to fit mini tart pans or a muffin tin. Press into pans, prick bottoms with a fork, and bake at 175°C for 12–15 minutes or until lightly golden. Let cool completely.
02 -
In a saucepan, whisk together lemon juice, zest, sugar, eggs, and egg yolk. Cook over medium heat, whisking constantly, until it thickens (5–7 minutes). Remove from heat and stir in butter until smooth. Cool slightly, then spoon into tart shells. Chill until set (at least 1 hour).
03 -
Beat heavy cream, powdered sugar, and vanilla until soft peaks form. Pipe or spoon onto chilled tarts.