Place the flour, butter, icing sugar, salt, and almonds in a mixing bowl.
Work the dough by rubbing it between your fingertips.
Add the egg and mix using a fork.
Turn the mixture out on a work surface and knead to form a smooth dough without overworking it.
Flatten the dough out slightly, wrap it in cling film and refrigerate for at least 30 minutes and up to 2 days.
Once the dough is chilled, preheat the oven to 180°C and let the dough sit at room temperature for 10 minutes until soft enough to roll but not too soft.
Roll the dough out on a lightly floured surface to ½ cm thickness / 23 cm (9") circle and line a 20 cm (8") fluted, loose-bottomed tart tin.
Press the dough firmly against the sides and bottom without stretching it and trim off the excess dough.
Prick the dough all over with a fork, cover it, and place it in the freezer for at least 30 minutes before blind baking.
Preheat the oven to 175° C - 350° F (fan oven).
Line the tart tin with parchment paper or tin foil, covering the edges to avoid them from burning.
Fill with dried chickpeas or rice to prevent the dough from rising and bake for about 15 minutes, remove the chickpeas or rice and cook for another 10 minutes until golden brown.
Let it cool down on a wire rack before filling it with the pastry cream.