Place the cake sponge in a bowl and crumble the cake by rubbing it with your hands (it’s best to use catering food gloves for this)
Heat the white chocolate and lemon curd together very slowly in microwave or bain marie.
Add the melted chocolate and lemon curd into the cake crumbs and mix well until evenly combined. Set aside, whilst you work on the chocolate eggshells.
Melt the white chocolate slowly in the microwave or on a bain marie and very gently bring the white chocolate temperature to about 27 C. Use your favourite method of chocolate tempering (see my notes above). If you are not familiar with this technique (or using a regular chocolate bar to melt), stir the chocolate until it thickens a bit.
Use the melted chocolate to fill the chocolate mould and either do a two thin layers of chocolate or one slightly thicker. This could be done either by pouring the chocolate in and out again or by brushing the chocolate into the mould.
Once your chocolate is set (this takes usually about 15 min in the fridge) fill the Easter Eggs with your cake filling, making sure that you leave out a 3-5 mm gap from the top.
Cover the Easter Eggs with the rest of your melted chocolate and use spatula or a scraper to tidy up the top of the mould. You can also tap the mould to make the top nice and smooth.
Refrigerate for 30 minutes until firm.