The next day, pour the chilled custard into an ice cream machine & start churning.
In the meantime, roughly chop the dark chocolate & place into a heatproof bowl.
When your ice cream has been churning for 15 minutes, heat the chocolate in a microwave for 20 second bursts (or over a bain marie) until just melted.
Transfer the chocolate into a piping bag & cut a small hole in the end.
Next, place the chilled mini eggs into a plastic food bag & crush into small pieces, using a rolling pin. Place them back in the fridge until the ice cream has finished churning.
When the ice cream has reached soft serve consistency (it will be around -5°c/23°f), slowly pipe the chocolate directly into the ice cream, whilst still churning. The chocolate will freeze into shards as it mixes through the ice cream.
Continue churning for another 30 seconds then gently fold through the crushed mini eggs.
Transfer the ice cream into a 1 litre tub & leave to set in the freezer for a minimum of 4 hours before serving.