Preheat the oven to 180°C (350°F).

Grease a jelly roll pan with butter or line it with parchment paper.

In a mixing bowl, beat the softened butter and caster sugar together until light and fluffy.

Beat in the eggs one at a time, then stir in the vanilla extract.

Gently fold in the self-raising flour until just combined.

Pour the batter into the prepared pan and bake for about 10 minutes.

Allow the sponge to cool completely in the pan.

Use a round cookie cutter to cut out circles from the cooled sponge.

Top each sponge with a spoonful of orange jelly.

Melt the dark chocolate and pour it over the jelly.

Let the chocolate set before serving.