In a mixing bowl, combine flour, butter, and powdered sugar. Mix until crumbly.

Add the egg yolk and cold water, mixing until a dough forms.

Wrap the dough in plastic wrap and refrigerate for 30 minutes.

In another bowl, whisk together ground almonds, sugar, eggs, vanilla extract, almond extract, and salt until smooth.

Preheat the oven to 350°F (175°C).

Roll out the chilled dough and cut into circles to fit the tartlet pans.

Press the dough into the pans and fill with the almond mixture.

Bake for 20-25 minutes or until the filling is set and golden.

Let cool before serving.