Peel and halve your onion and place into a medium-sized saucepan.
Pour over your milk and double cream, then add the cloves, a good pinch of freshly ground black pepper, about half the nutmeg and a couple of bay leaves.
Heat the mixture gently over a low heat and leave to simmer gently. This is not so much about heating the mixture, but about infusing the milk with all of the delicious flavours. After about 20 minutes, strain the liquid through a sieve, pressing down to make sure that you release as much flavour as possible from the onion, herbs and spices.
Blitz your bread into breadcrumbs and add to the mixture, along with a knob of butter. Give everything a good stir until well combined - the breadcrumbs should soak up all of that delicious sauce. Continue to add breadcrumbs until you've reached the desired consistency.
Finish with a sprinkling of the remaining nutmeg.