Cut the onion in half and stick cloves in it, or alternatively, use freshly grated nutmeg according to personal preference.
Onion, Cloves or freshly grated nutmeg
In a saucepan, place the onion along with a bay leaf, peppercorns, and milk.
Bay leaf, Black peppercorns, Breakfast milk
Bring the mixture to boiling point and let it infuse for two hours or more, allowing the flavors to develop.
Remove the onion, bay leaf, and peppercorns from the infused milk.
Stir breadcrumbs into the milk and add butter.
Butter
Heat the mixture gently until the sauce thickens to the desired consistency.
Before serving, remove the onion and spices, reheat the sauce gently, and add the remaining butter and cream.
Double cream
Season the sauce to taste and pour it into a warm serving jug.