Instructions:

Make the cookie dough:
In a bowl, beat the butter with the sugar until light and fluffy.
Beat in the egg and vanilla extract.
Gradually mix the ground almonds, flour and a pinch of salt together until a dough forms.
Wrap the dough in plastic wrap and chill in the refrigerator for at least 1 hour.

Shape the cookies:

Preheat the oven to 350°F (175°C).
Roll the chilled dough into small balls, then flatten slightly to form thick disks.
Place the shaped cookies on a baking sheet lined with parchment paper.

Bake the cookies:
Bake the cookies for 10-12 minutes or until they begin to brown around the edges.
Remove from the oven and let cool completely on a wire rack.

Add the chocolate and sesame seeds:

Melt the dark chocolate in a heatproof bowl over a pan of simmering water (bain-marie method) or in the microwave in short bursts, stirring frequently.
Dip each cooled cookie into the melted chocolate, covering them halfway or completely, depending on your preference.
Before the chocolate hardens, sprinkle the sesame seeds over the chocolate.