Mix the flour (1), the icing sugar, the salt, the lemon zest and the almond flour in a mixer using the paddle attachment .
Add the butter and the eggs gradually.
Finally add the flour (2) and work until you have a smooth mixture.
Spread a 2.5 mm thick layer between two sheets of baking paper, freeze and cut using a round cookie cutter.
Bake between two perforated silicone mats with the oven at 150°C and with the door open slightly.