Melt the chocolate in a heatproof bowl set over a pan of simmering water.
Whisk the eggs with the liqueur in a separate bowl over a pan of simmering water until double in size. It is very important to ensure the water does not boil or it will cook the eggs.
Fold the melted chocolate into the egg mixture, then leave to cool for 5 minutes.
Meanwhile, whisk the cream in a bowl, fold into the chocolate mixture, then put into stemmed glasses or teacups using a spatula.
Cover with cling film and refrigerate for 2–3 hours or overnight. Spoon over the berries and add a sprig of mint to serve.
Serving Suggestions
This rich, intensely chocolatey dessert not only looks great in glasses but also in vintage teacups. It can also be scooped into quenelles. Sometimes I’ll serve it with a couple of thin buttery biscuits for dipping, or perhaps an ice-cold glass of the liqueur I’ve used to flavour the mousse.