Place 2-3 dates on each rice cake and use a glass to flatten them down.
Zest the orange on top of the date layer.
Melt the dark chocolate gently (bain-marie or microwave in short bursts).
Dip each rice cake into the melted chocolate, coating fully or just the top for a classic look.
Place on parchment paper to set.
Chill in the fridge for 15 minutes until the chocolate is set and firm.
