Put the custard in a bowl with the chocolate. Heat in the microwave for 2-3 minutes, stirring occasionally, until the chocolate has completely melted into the custard. Cover with clingfilm and chill.
Press the madeleines and Easter chocolate around the bottom edge and over the base of a 1 litre glass trifle bowl. Sprinkle with the liqueur.
Add a layer of sliced pear.
Spoon the chocolate custard over the pears.
Finally, whip the cream until it just holds its shape in soft peaks. Spoon on top of the chocolate custard. Sprinkle with chopped mini Easter eggs and chocolate curls.
The trifle can be made ahead and kept covered in the 'fridge, without the whipped cream. About an hour before serving, add the whipped cream and chocolate decoration and keep in the 'fridge.