Melt the chocolate using a double boiler (bain-marie method).

Remove the pits from the dates.

Arrange the dates on parchment paper in your desired shape and press them slightly so they stick together and form a compact layer.

Pour the melted chocolate over the dates, covering the surface completely.

Sprinkle chopped walnuts over the chocolate.

Refrigerate for about half a day (several hours) until set.

Cut into your desired shapes and serve.