Put the studded onion into a pan with 350 ml Whole milk, 1 Bay leaf, 4 Black peppercorns and 1 pinch Nutmeg. Bring to the boil, then remove from the heat. Cover with a lid and let sit for 15 minutes.
Place a sieve over a bowl and pour in the liquid. This will leave you with an infused milk.
Return the milk to a pan and stir in breadcrumbs made from 90 g White bread. Heat over a low heat for 7-8 minutes.
Add 30 g Butter and 1 pinch Sea salt and ground black pepper and stir in until the butter has melted.
Notes
If you want to make this bread sauce a little more indulgent, then you could stir in some cream at the same time as the butter.
Don't skip the step of infusing the milk with the onion, cloves and peppercorns as it really does add the most incredible flavour.
For extra flavour your could add some dried rosemary or thyme, or even a little garlic.
You don't have to stud the onion, you could just put everything into the milk. But we find this just makes it easier to get everything out and minimised clean up.
If you want a thinner sauce, then add a little more milk to it.