Grate the ginger into a square of muslin.
Squeeze the muslin to force out and save the ginger juice.
Blitz eggs, butter, flour, and sugar in a food processor until combined.
Add 5ml of ginger juice to the batter.
Mix the honey and mixed spice into the pudding batter.
Pour the batter into a greased pudding bowl.
Cover with cling film and microwave on High for 4.5 minutes.
Heat the milk in a small saucepan.
Combine the eggs and sugar in a small bowl.
Whisk the boiled milk into the egg and sugar mixture.
Remove the pudding from the microwave and discard the film.
Turn the pudding out onto a plate and serve with custard.