Mix the soft butter at room temperature with the salt, icing sugar, powdered almonds, and cocoa.
Quickly mix without allowing it to gather using the kneading blade.
Add the flour, mix together, and chill.
Roll out the dough between sheets of parchment paper and leave to chill in the refrigerator.
Assemble the tartlets.
Use a round mould with a wavy edge, 18 cm in diameter.
Cool the dough in the mould for at least 15 minutes.
Bake at 150°C for 9 minutes.
Leave to cool while you prepare the chocolate filling.